When did Margaret Thatcher became the first women Prime Minister of Britain?

Margaret Thatcher became the first female Prime Minister of the United Kingdom in 1979. She served as Prime Minister for 11 years, making her the longest-serving British Prime Minister of the 20th century. She was a controversial figure, but she is also considered to be one of the most influential British Prime Ministers of all time.

Option A is incorrect because Margaret Thatcher became Prime Minister in 1979, not 1998.

Option B is incorrect because Margaret Thatcher became Prime Minister in 1979, not 1989.

Option C is the correct answer. Margaret Thatcher became Prime Minister in 1979.

Option D is incorrect because Margaret Thatcher became Prime Minister in 1979, not 1800.