ATTEMPT

Answer: Option C

Serve : perform duties or services for (another person or an organization).
Explore : travel through (an unfamiliar area) in order to learn about it.
Try : make an attempt or effort to do something.
Explain : make (an idea or situation) clear to someone by describing it in more detail or revealing relevant facts.
Attempt : make an effort to achieve or complete (something difficult).


Synonym of Attempt is Try