Question

what is energy?
power divided by matter
the ability to make something happen
the weight of an object
the total amount of matter in an object

Explanation:

Energy is defined as the ability to do work or cause change, which aligns with "the ability to make something happen". "Power divided by matter" is not a standard definition. "The weight of an object" relates to force due to gravity. "The total amount of matter in an object" is mass.

Answer:

The ability to make something happen