Which of the following is the most important reasons why the highest densities of cattle in West Africa are to be found in the Sudan and Sahel Savannah zones?

A.

The two zones are far from the coast

B.

The two zones have abundant water resources

C.

The two zones have abundant fodder resouces

D.

The two zones are largely free from tsetse flies

E.

The two zones have moderate temperature

Correct answer is D

No explanation has been provided for this answer.