The statement that best explains the development of constitutional monarchy in England is:
The idea that a monarch’s powers should not be absolute was first made law in the Magna Carta, and with the Glorious Revolution it became the basis of England’s monarchial system.
This explanation captures the historical significance of both the Magna Carta and the Glorious Revolution in the gradual shift from absolute monarchy towards constitutional monarchy, emphasizing the legal foundations laid down and their lasting impact on the monarchy's relationship with Parliament.