Revolutions need momentum. They also need a very smart, well educated, as well as charismatic person to take control. Revolutions are not about little people rising up against the rich and powerful. It is a transfer of positions of power between the leader class.
The correct answer is D. had its power limited
According to the dictionary it means "a prolonged period of abnormally low rainfall, leading to a shortage of water."
Basically it's when there is very little rain or water and the amount of water in a place decreases.