The sentence can be completed as follows; Everyone needs a sense of a) humor
The meaning of the phrase
The phrase "Everyone needs a sense of humor" means that having the ability to find things funny and laugh is an important part of being human. Sharing a laugh strengthens bonds and fosters positive relationships.
Humor can act as a social lubricant, helping us connect with others and build rapport. So, the best way to complete the sentence is to say that "Everyone needs a sense of humor" and not a sense of comedy.