When was England ruled by a republic and not by a monarch?

問題： When was England ruled by a republic and not by a monarch?

選擇：When Elizabeth I died without any successor
When Charles I was executed
When the Carta Magna restricted the king’s power When kind Harold died after the Battle of Hastings

正確答案：
2

解釋:

When Charles I was executed, England declared itself a republic, called the Commonwealth. It no longer had a monarch.