What do aquifers and reservoirs have in common?
A) They're both underground
B)They're both made of rock
C)They're both man-made
D)They're both filled with freshwater

The answer is they are both filled with fresh water

Hop this helped! have a good day :) :) :) :) :)

:)

Explanation:

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.