B. When the sun and the moon are aligned, their combined gravitational force attracts the water, causing super high tides on one side of the planet, and super low tides on the opposite side.
Hi there!
Recall the equation for spring potential energy:

k = Spring constant (N/m)
x = extension of spring from equilibrium (m)
PE = Potential Energy (J)
Plug in the given values:

To do this you would take 64 and divide it by 4.
64/4= 16.
Your answer is 16.
C because mass is how much space an object takes up