In November 2005, Liberia became the first African country to elect a woman as its Head of State. This answer is correct.

Option 1: Angola is not the correct answer in this case because the first woman Head of State in Africa was elected in Liberia, not Angola.

Option 2: Gabon is not the correct answer in this case because the first woman Head of State in Africa was elected in Liberia, not Gabon.

Option 3: Liberia is the correct answer. In November 2005, Ellen Johnson Sirleaf was elected as the President of Liberia, becoming the first woman to be elected as a Head of State in Africa.

Option 4: Mozambique is not the correct answer in this case because the first woman Head of State in Africa was elected in Liberia, not Mozambique.

To summarize, the correct answer is option 3, Liberia, as Ellen Johnson Sirleaf became Africa`s first woman Head of State in November 2005.