Context clues??? i don't if im right sorry
Im pretty sure its d because stanzas have to have the same amount of lines and a break is in between stanzas but idk lmk if im wrong
- - C.<span>He; subject
This is because if "X and Harold" are the subjects, and to complete this using "he", it would also have to be a subject.
He and Harold </span><span>are going on a camping trip next month.</span>