Answer:
So reservoir will take 455000 sec to raise 35 cm
Explanation:
We have given surface area of the reservoir = 650000 
Rate of flow = 0.5 m/sec
Height through which reservoir is raise = 35 cm = 0.35 m
So volume 
We have to calculate the time
Time is given by 
D. Density
The bulk density of a planet will reflect the relative amounts of the materials the world is made of, regardless of what materials occur at the surface.
I believe that would be B