The correct answer is (c). Clara Zetkin was a German socialist and women’s rights activist. In 1910, she proposed the idea of an International Women’s Day at the International Conference of Working Women in Copenhagen. The first International Women’s Day was celebrated on March 19, 1911, in Austria, Denmark, Germany, and Switzerland.
Margaret Cousin was a Scottish teacher and writer. She was a strong advocate for women’s education and rights. She was not involved in the founding of International Women’s Day.
Aruna Asaf Ali was an Indian independence activist. She was not involved in the founding of International Women’s Day.
Lucy Stone was an American abolitionist and women’s rights activist. She was not involved in the founding of International Women’s Day.