Prep2012-Pack1-CR-069 VCR005518 Hard 理不清逻辑关系受不了了

Prep2012-Pack1-CR-069 VCR005518 Hard

Southington University's fund-raisers succeeded in getting donations from 80 percent of the potential donors they contacted this year. This rate would be the expected rate if the only potential donors contacted were those who have donated in the past. But good fund-raisers constantly contact less likely prospects in an effort to expand the donor base（什么意思）. Thus the high success rate, far from showing that the fund-raisers did a good job, shows insufficient canvassing effort.

Which of the following, if true, most seriously weakens the argument?

A. Among potential donors contacted by Southington University's fund-raisers, the majority of those who did not make donations were people who had made donations to the university in the past.

B. The amount of money raised by Southington University's fundraisers this year was lower than the amount they had raised in any of the previous several years.

C. Individual donations made to Southington University this year were, on average, slightly larger than were average individual donations made to manyother universities.

D. Fund-raisers contacting past donors are not only to get new donations but also to get names of potential new donors to contact.