Final answer:
Margaret Thatcher was the first female Prime Minister of the United Kingdom, serving from 1979 to 1990, known for her strong economic policies and environmental concerns. The correct answer is option: a. Margaret Thatcher.
Step-by-step explanation:
The first female Prime Minister of the United Kingdom was Margaret Thatcher. She became the Prime Minister in 1979 and served until 1990.
Despite other notable female leaders around the world like Sirimavo Bandaranaike of Sri Lanka, who was the first female prime minister in the world, and Benazir Bhutto, the first female Prime Minister of Pakistan, Margaret Thatcher's election marked a significant moment in British history. Her leadership included strong stances on the economy and international relations, particularly memorable was her urgent warning about environmental issues, including climate change, at the United Nations in 1989, revealing her forward-thinking approach to global affairs.