Final answer:
The main reason for the English Civil War of 1642 was that the Parliamentarians demanded that some of the king’s power be transferred to them, which angered the Royalists.
Step-by-step explanation:
The main reason for the English Civil War of 1642 was primarily a. The Parliamentarians demanded that some of the king’s power be transferred to them, which angered the Royalists. This conflict was a result of political and religious upheavals, where tensions escalated between Protestants and Catholics, and struggles for power between the king and Parliament intensified.