prep 的2个题目不解。。。

87. Two years ago, the government of Runagia increased by 20 percent the government-provided pensions paid to Runagians over 65. The aim of the increase was to stimulate the economy in the rural regions of the country, where most pension recipients live. Statistics, however, show that there has been no increase in economic activity in those regions since then, but that there has been noticeably more spending in the urban areas.
Which of the following, if true, most helps to explain why the increase resulted in the unintended state of affairs described?
A. Until the pensions were increased, many Runagians over 65 in rural regions had been receiving support from their children who live in urban areas.
B. The pensions were increased when the number of people below the poverty level in rural
areas of Runagia reached an all-time high.
C. City-dwellers in Runagia rarely travel to rural regions of the country.
D. The Runagian postal system is so inefficient that it can take up to three weeks for pension checks to reach recipients in rural areas.
E. On average, the pensions were higher in rural than in urban areas before the increase.

说A是正确答案有点勉强

93. (GWD-21-Q38 different type)
Because it was long thought that few people would watch lengthy televised political messages, most televised political advertisements, like commercial advertisements, took the form of short messages. Last year, however, one candidate produced a half-hour-long advertisement. At the beginning of the half-hour slot a substantial portion of the viewing public had tuned in to that station. Clearly, then, many more people are interested in lengthy televised political messages than was previously thought.
Which of the following, if true, most seriously weakens the argument?
A. The candidate who produced the half-hour-long advertisement did not win election at the polls.
B. The half-hour-long advertisement was widely publicized before it was broadcast.
C. The half-hour-long advertisement was aired during a time slot normally taken by one of
the most popular prime-time shows.
D. Most short political advertisements are aired during a wide range of programs in order to reach a broad spectrum of viewers.
E. In general a regular-length television program that features debate about current political

B,C两个选项请解释下？