The best statement that explains the development of constitutional monarchy in England is:
"The idea that a monarch’s power 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 statement accurately captures the historical progression from the Magna Carta, which established the principle that the king's power was not absolute, through to the Glorious Revolution, which further solidified the limitations on royal authority and laid the groundwork for a constitutional monarchy.