OG-136再次请教，还是没明白

fbfamous

136. Because postage rates are rising, Home Decorator magazine plans to maximize its profits by reducing by one half the number of issues it publishes each year. The quality of articles, the number of articles published per year, and the subscription price will not change. Market research shows that neither subscribers nor advertisers will be lost if the magazine's plan is instituted.
Which of the following, if true, provides the strongest evidence that the magazine's profits are likely to decline if the plan is instituted?
(A) With the new postage rates, a typical issue under the proposed plan would cost about one-third more to mail than a typical current issue would.
(B) The majority of the magazine's subscribers are less concerned about a possible
reduction in the quantity of the magazine's articles than about a possible loss of the
current high quality of its articles.
(C) Many of the magazine's long-time subscribers would continue their subscriptions even
if the subscription price were increased.
(D) Most of the advertisers that purchase advertising space in the magazine will continue to
spend the same amount on advertising per issue as they have in the past.
(E) Production costs for the magazine are expected to remain stable.

实在对不起各位，这个题以前讨论过，不过我还是不明白：

profit=revenue—cost  对吧？那我不明白答案D，杂志是每个issue都有revenue的和cost，那凭什么说半数的issue少了，那就一定是利润少了呢？它成本不是还少了么？

还有A，既然说每个issue的价格都涨了，那就是平均每个issue的利润降低了呀？不就是总利润降低么？？我真的是不明白，除非他问的是总收入而不是利润。可是这就概念明显不同了吧？？？不明白不明白！！！痛苦死了！！！！