this is a good question and the pattern of this question is so common in gmat. Nevertheless, I do believe the question is very ambiguous.
Only A and C are closed. While A connects with the donors who have never given before, C relates to the donors who already made contributions before. For this reason, A is correct b/c A eliminates an alternative explanations that concerns with the donors who have never given before.
The question is so ambiguous not because of tricky words, but because the logic
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Only A and C are closed. While A connects with the donors who have never given before, C relates to the donors who already made contributions before. For this reason, A is correct b/c A eliminates an alternative explanations that concerns with the donors who have never given before.
The question is so ambiguous not because of tricky words, but because the logic
...
