In what way were Puritans involved in the English Civil War?

AMany fought on the side of the king.
BMany fought against Parliament.
CMany hoped to increase the power of the Church of England.
DMany fought in forces against the king.

Verified Answer :

The best option would be that "D. Many fought in forces against the king," and many did this by supporting the Parliamentarians, although there were other groups as well. Some of course did not get involved in the conflict at all. 

I just took this test! The correct answer was (D) "Many fought in forces against the king"