TTGWD2-Q1

Q8:TTGWD2-Q1:

Neither First Lady Eleanor Roosevelt nor Secretary of Labor Frances Perkins sought recognition by the press, and both cautiously allowed others of the Roosevelt brain trust to take credit for the genesis of historic programs in public employment, relief, and social security that were in large measure what they had been responsible for.

1. to take credit for the genesis of historic programs in public employment, relief, and social security that were in large measure what they had been responsible for   （they自动指代主句主语？）

2. to take credit for the genesis of historic programs in public employment, relief, and social security for which the two women were in large measure responsible

3. taking credit for the genesis of historic programs in public employment, relief, and social security for which the two women were in large measure responsible    

4. taking credit for the genesis of historic programs in public employment, relief, and social security that were in large measure what they were responsible for   

5. taking credit for the genesis of historic programs in public employment, relief, and social security which were largely their responsibility

这提也没搜到讨论贴，答案应在a,b中选，A中不好我是觉得they可能指代不清，还有时态用一般过去式就可以了

B中不好我是觉得which有指代不清之嫌，指代employment, relief, and social security还是指代social security?

这道题答案是选B 吗？