Question

should there be a comma before the highlighted word?
gumball watterson carries his guitar, wherever he goes.
keep the comma
remove the comma

Explanation:

The clause starting with "wherever" is a dependent adverbial clause that modifies the main verb "carries" and is essential to the meaning of the sentence (it specifies where Gumball carries his guitar). Essential dependent clauses do not require a comma before them.

Answer:

Remove the Comma