Compared to the rest of the planet, an unusually high concentration of hot spots and rifting is located on the continent of africa. a likely explanation for this is that

The rifting and growing number of hot-spots in Africa is due to the intense geological activity in the eastern part of the continent. The eastern part of Africa is moving away in an eastward direction from the mainland, thus creating rifting, and as it moves away more and more the rifts are becoming bigger, and eventually will be filled with ocean water. Because of the rifting, the crust in this part is weaker and thinner, which enables the high pressure and high temperature from the mantle to easily penetrate through it, thus creating an ever growing number of hot-spots.

the correct answer is c.

answer (a) more rain in u s and less rain in australia and asia