Uprisings in the cities of what two countries began the revolt which led to demands for democracy, free elections, and an end to corruption across the arab world?

Tunisia and Egypt

Explanation:

The 2010's Arab Spring was a succession of revolts, protests and armed conflicts that spread in north Africa and the Middle East, which were caused by discontentment against dictatorial governments and inadequate life standards. Therefore, the uprisings advocated mainly for democracy, free elections, employment and human rights.

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

i think the answer would be reserve.