一道语法题，没思路，求助

小城假日

Oberlin College in Ohio was a renegrade institution at its 1833 founding for deciding to accept both men and women as students.

A  at its 1833 founding for deciding to accept
B  for the decision at its 1833 founding to accept
C  when it was founded in 1833 for its decision to accept
D  in deciding at its founding in 1833 to accept
E  by deciding at its founding in 1833 on the acceptance of


答案选D。 这题完全没有思路，可以排除E ，但是其他的选项怎么分析呢？

求NN帮助！万分感谢！