Which statement describes the relationship between energy and entropy in the universe? energy must be destroyed for entropy to be constant. energy must be decreased for entropy to be constant. energy must be added to decrease entropy. energy must be created to increase entropy.

The correct answer* is:
Energy must be added to decrease entropy. 

In fact, entropy of an isolated system never decreases (2nd law of thermodynamics), unless some external energy is provided in order to "restore" order in the system and decrease its entropy.
(note that when external energy is added to the system, it is no longer "isolated").

*This is only true if the question is referring to a certain system within the universe. If we are considering the universe itself as the system, then this option is no longer correct, because no external energy can be provided to the universe, and since the universe is an isolated system, its entropy can never decrease. If we are considering the universe itself as the system, none of the options is true.