请教section8

7.     The British Admiralty and the War Office met in March 1892 to consider a possible Russian attempt to seize Constantinople and how they would have to act militarily to deal with them.

(A) how they would have to act militarily to deal with them

(B) how to deal with them if military action would be necessary

(C) what would be necessary militarily for dealing with such an event

(D) what military action would be necessary in order to deal with such an event

(E) the necessity of what kind of military action in order to take for dealing with it

答案是D，我选了C

主要想问下是不是FOR DOING这个表达是有误的，还是跟TO DO, IN ORDER TO DO 他们PK的时候是错的，感觉做的选项里只要这几个表达，FOR DOING都是错的

希望NN帮忙讲一下FOR DOING的用法，我记得好像是用在物上表目的，不知道对不对

A。they 指代不清

B。重心转移,them有嫌疑

C.militarily错，be necessary to do sth固定搭配

D。正确

E。IT指代不清，句式不简洁。