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 captures the key historical developments that influenced the transition from absolute monarchy to constitutional monarchy, highlighting the significance of the Magna Carta in limiting royal power and the role of the Glorious Revolution in establishing parliamentary sovereignty.