狒狒的几道逻辑题，请指教

以下是引用方向在2003-9-15 23:13:00的发言：
3. Because of the recent recession in Country A most magazines published there have experienced decreases in advertising revenue, so much so that the survival of the most widely read magazines is in grave doubt. At the same time, however, more people in Country A are reading more magazines than ever before, and the number of financially successful magazines in Country A is greater than ever.
Which one of the following, if true, most helps to resole the apparent discrepancy in the inFORMation above?
(A) Most magazines reduce the amount they charge for advertisement’s during a recession.
(B) The audience for a successful television show far exceeds the readership of even the most widely read magazine.
(C) Advertising is the main source of revenue only for the most widely read magazines; other magazines rely on circulation for their revenue.
(D) Because of the recession, people in Country A have cut back on magazine subscriptions and are reading borrowed magazines.
(E) More of the new general interest magazines that were launched this year in Country A have survived than survived in previous years.
答案是c，有关系么？

  多谢大虾指教

以下是引用方向在2003-9-16 13:34:00的发言：
. 那么这句话 “at the same time, however, more people in country a are reading more magazines than ever before, and the number of financially successful magazines in country a is greater than ever. “和答案有什么关系么？

以下是引用方向在2003-9-15 23:13:00的发言：
21. Historian: We can learn about the medical history of individuals through chemical analysis of their hair. It is likely, for example, that Isaac Newton’s psychological problems were due to mercury poisoning; traces of mercury were found in his hair. Analysis is now being done on a lock of Beethoven’s hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven’s time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that this hypothesis is correct.
Which one of the following is an assumption on which the historian’s argument depends?
(A) None of the mercury introduced into the body can be eliminated.
(B) Some people in Beethoven’s time did not ingest mercury.
(C) Mercury is an effective treatment for venereal disease.
(D) Mercury poisoning can cause deafness in people with venereal disease.
(E) Beethoven suffered from psychological problems of the same severity as Newton’s.
答案是：b，但是我认为应该是a

以下是引用方向在2003-9-15 23:13:00的发言：
2. In 1992, a major newspaper circulated throughout North American paid its reporters an average salary paid by its principle competitors to their reporters. An executive of the newspaper argued that this practice was justified, since any shortfall that might exist in the reporters’ salaries is fully compensated by the valuable training they receive through their assignments.
Which one of the following, if true about the newspaper in 1992, most seriously undermines the justification offered by the executive?
(A) Senior reporters at the newspaper earned as much as reporters of similar stature who worked for the newspaper’s principle competitors.
(B) Most of the newspaper’s reporters had worked there for more than ten years.
(C) The circulation of the newspaper had recently reached a plateau, after it had increased steadily throughout the 1980s.
(D) The union that represented reporters at the newspaper was different from the union that represented reporters at the newspaper’s competitors.
(E) The newspaper was widely read throughout continental Europe and Great Britain as well as North America.
答案是：b 为什么呢？
多谢大虾指教