Answer:
B. A dish of water is placed in the freezer and turns solid
Explanation:
it is a physical change because it can return to its original state by physical means. the other options are chemical changes because things like color change, bubbles or fizzing, and odor change all indicate a chemical change and cannot return to the original state it was in before.
Dependent and independent variables.
The increase in gravitational potential energy for an object of mass m is given by

where

is the increase in altitude of the object.
In our problem, m=3.0 kg,

and

(approximated value), so we have