Which of the following was not a direct response to communist aggression in north korea in 1950

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be the one having to do with dropping an "atomic bomb," since this was only used in WWII. 

The nineteenth amendment changed voting rights as it allowed for women to vote nation wide

What effect did the development of trade have on settlement patterns in medieval times