What is the only way that entropy can decrease in a system?

Question

If energy is created by the system.
If work is removed from the system.
If energy is decreased from the system.
If work is put into the system.

Answer 1

The only way that entropy can decrease in a system is if work is put into the system.

This is because entropy is a measure of disorder or randomness in a system, and generally, the second law of thermodynamics states that the total entropy of an isolated system can only increase over time. However, by inputting work (energy) into a system, it is possible to decrease the entropy of that specific system, although the total entropy of the universe will still increase.