Who fought the civil war taking place in 1642 to 1645?
the cavaliers and the royalists
the roundheads and the puritans
the royalists and the roundheads

It was the Royalists against the Roundheads during the English Civil War.  The Royalists represented the monarchy while the Roundheads presented parliament.  At first, the Royalists had the upper hand but with the emergence of the New Model Army led by Oliver Cromwell the tide turned for the Roundheads with victories such as Naseby and the fall of Bristol.  Later the forces of Parliament won.

I’m pretty sure it’s 4, you can check on the calculator