请教in order to 和 to 的区别

OG

73. 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

正确答案是d, 但是不太明白这里为什么一定要用in order to 呢？

原句里只是用to

请教in order to 和 to 的区别

发完帖子，好像突然明白些什么

in order to 是强调目的， 而且范围是包括前面的attempt的

如果改成to 就没有这种强调了。而且可能会认识是 be necessary to 的固定搭配