The major difference between the British and U.S. governments among the options provided is:
The leader of Britain is chosen by the legislature.
In the United Kingdom, the Prime Minister is typically the leader of the majority party in Parliament and is chosen by the members of the House of Commons. In contrast, the President of the United States is elected directly by the people through an electoral process.
The other statements are either misleading or incorrect in this context. For example, the UK is not a federal government system like the United States, and it does not have a single written constitution that includes a list of individual rights, although it does have various laws and conventions that protect rights. Additionally, both countries operate under the rule of law.