Which has the least potential energy?

gases
liquids
solids
will mark brainlist

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Edward tolman explained the results of his study by theorizing that the rats were learning about the maze during every trial but they a. were agitated because other groups were getting reinforcement b. could not remember how to demonstrate it without reinforcement c. were not motivated to demonstrate it without reinforcement d. seemed to be too lazy to actually work without reinforcement

Could someone me find the answer to this problem.