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 statement highlights the foundational role of the Magna Carta in limiting royal power and the significance of the Glorious Revolution in further establishing constitutional and parliamentary authority, which together laid the groundwork for constitutional monarchy in England.