An important effect of the Magna Carta on English government was that it

established a monarchy.
gave voting rights to all citizens.
reduced the rights of citizens.
gave more power to the people and protected their rights.

gave more power to the people and protected their rights.

The correct answer is:

gave more power to the people and protected their rights.

The Magna Carta, signed in 1215, was a significant document in English history that established certain principles and limitations on the power of the monarchy. It sought to address grievances of the subjects and placed restrictions on the monarchy's authority. It helped shift power from the king towards the people, ensuring that certain rights and liberties were recognized and protected.