It's not a person, never heard of a place called 'happiness', or I would go there.
It has to be a thing. Meaning it's a noun.
Examples of Covert in a sentence The spy went to great lengths to make sure his enemies would not discover his covert plans. Because my husband is always snooping into my affairs, I am working very hard to keep his surprise party covert.
this what it means covert :not openly acknowledged or displayed.
Answer:
C.
Explanation:
It provides the adventures he has had.