A         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？）

B       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

C        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

D        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

E        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？