The Vietnam war was an issue that arose from WW2.
In America, we have very many different denominations. For example, we have the Catholics and the protestant but they were termed as the ones who occupy a large number in America.
Some of the Protestant denomination who emphasized on national sin were Presbyterian and Congregationalist.
That protestant denomination preached emphasizing on personal public confession were Baptist and Methodists.
The answer is C. It is not direct but is implied through the elastic clause