Drought is when amount of precipitation decreases.
If there's a drought, a lot of people die.
If precipitation decreases, a lot of people can die.
One of the major consequences of a drop in precipitation is 

A: shattered rain gauges
B: enormous damage to homes
C: floods
D: Plant growth is reduced
E: a lot of human deaths
F: meteorite impacts
G: The bending of a ray of light
H: major threat to health