Without the influence of colonialism, would African countries be as ethnically diverse as they are today?

Most likely yes

Explanation:

Let's see all the ethnic tribes before colonization. I attached a picture of Africa before it was colonized and you could see all the different ethnic tribes there were. One of the most ethnically diverse countries was Nigeria which had 300> tribes all killing each other, and when the British came in they split it between the three largest tribes. Colonization put down all these different conflicts between the tribes, but colonization itself had a lot more negatives than positives.

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.

the awenser wuold be slaves