What significant achievement is Margaret Thatcher known for in 1979?

Margaret Thatcher's place in British history is cemented by her becoming the first woman Prime Minister in 1979. Before her, the role had always been held by men. This was a huge moment, breaking a significant barrier in British politics. While she later became known for her strong leadership during the Falklands War in 1982 and her controversial economic policies, it was her initial election victory that marked her entry into the history books. The other options relate to different aspects of British history and female empowerment. Although women campaigned for equal voting rights, this happened much earlier, with full equality achieved in 1928. While Thatcher led during the Falklands War, that wasn't her initial achievement. And becoming a High Court judge, while a notable achievement for any woman, isn't specifically associated with Margaret Thatcher's legacy. Her premiership itself was the groundbreaking event.