The correct answer is B.
There are 54 sovereign nations in Africa and the most common type of government is a presidential republic, followed by a parliamentary republic, semi-presidential republic and traditional monarchies.
In a presidential republic the president, who is the elected official, is the executive authority. The president is often installed by a military coup or a civil war rather than election. Presidential republics in Africa vary in regards of the level of power entrusted to the president.
Twenty-six African nations have presidential republic governments.