The first woman elected to head an African country in 2006?

The first woman elected to head an African country in 2006?

A. Ellen Johnson
B. Graca Machel
C. Winnie Mandela
D. Helen Zille

Ellen Johnson Sirleaf (born 29 October 1938) is a Liberian politician who served as the 24th President of Liberia from 2006 to 2018. Sirleaf was the first elected female head of state in Africa