Which one of the following countries possesses an evolved constitution?

مندرجہ ذیل میں سے کون سا ملک ایک ترقی یافتہ آئین رکھتا ہے؟

Britain

U.S.A

Switzerland

All the above countries

Explanation

Britain possesses an evolved constitution, meaning that its constitution has developed over time through a series of laws, customs, and conventions, rather than being written in a single document. This is also known as an "unwritten constitution".