The Two Water Reservoirs Shown in the Figure Are Open

Multiple Choice

The two water reservoirs shown in the figure are open to the atmosphere,and the water has density 1000 kg/m³.The manometer contains incompressible mercury with a density of 13,600 kg/m³.What is the difference in elevation h if the manometer reading m is 25.0 cm?

A) 1.58 m
B) 4.20 m
C) 3.75 m
D) 3.40 m
E) 3.15 m