Use the drop-down menu to complete the sentence.

The wealth of East African city-states was based on...

A. Control of natural resources

B. Farming

C. Trade

D. Gold mining

*Will award Brainliest if it’s correct*

Trade

Explanation:

Gold wasn't as valuable in Africa as in other places

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

c is the newer have a great day