What European development played the greatest role in permitting Europeans to imperialize Africa?

Military power.

Explanation:

Military power is the development played the greatest role in permitting Europeans to imperialize Africa because the Europeans has high military power as well as latest weapons which help them to rule over the African countries. African countries lack the modern weapons which cost them a lot when they fought war against the Europeans so the military power and latest weapon helps them to imperialize Africa.

.elections are held to determine who serves in congress.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.