Antonym of PROBLEM

Answer: Option B

Problem : a matter or situation regarded as unwelcome or harmful and needing to be dealt with and overcome.
Reply : say something in response to something someone has said.
Solution : a means of solving a problem or dealing with a difficult situation.
Answer : a thing that is said, written, or done as a reaction to a question, statement, or situation.
Resolution : a firm decision to do or not to do something.

Antonym of Problem is Solution