2 XDF练习题问题

以下是引用sbbi在2003-9-18 0:59:00的发言：
In the country of Laurelia，legal restrictions on the sale of lock-picking
equipment were relaxed ten years ago，and since then Laurelia's burglary rate
has risen dramatically．Hence，since legally purchased lock-picking equipment
was used in most burglaries，reintroducing strict limits on the sale of this
equipment would help to reduce Laurelia's burglary rate．
　　　
Which of the following，if true，gives the strongest support to the argument？

C) The reintroduction of strict limits on the sale of lock-picking equipment
in Laurelia would not prevent legitimate use of this equipment by police and
other public safety officials．
D) Most lock-picking equipment used in Laurelia is fragile and usually breaks
irreparably within a few years of purchase．

Answer is D. understand. But I think C is also a support. right?

以下是引用sbbi在2003-9-18 0:59:00的发言：
In a recent film set in seventeenth century Europe，the hero is seen doing the
crawl，a swimming stroke not known in Europe before the 1920s． However，since
moviegoers obviously are not experts in the history of swimming strokes，for most
of the film audiences，this blunder clearly can not have interfered with whatever
sense of historical authenticity the film otherwise achieved．
　　　
Which of the following，if true，most seriously weakens the argument given？
a)The film was widely praised for being historically plausible，even though it
portrayed many events that were not historically attested．
b)The scene that shows the film's hero doing the crawl is a rescue scene pivotal
to the film's action，and parts of it are even shown a second time，in a flashback
C)Makers of historical films，even of those set as recently as the nineteenth
century，routinely strike compromises between historical authenticity and the
need to keep their material accessible to a modern audience，as in the actors's
speech patterns．
d)The crawl that European swimmers used in the 1920's was much less efficient
and more awkward-looking than the crawl that is currently taught．
E)A slightly earlier film featuring an eighteenth century sea battle in Europe
was ridiculed in numerous popular reviews for the historical lapse of showing a
sailor doing the crawl in swimming to safety

Answer is E. Why? why not B?

Thanks!