The correct answer is; After the gym on Monday, only one of the boys made it to their next class on time.
A pronoun must match its antecedent in terms of number, gender, and person. An antecedent is a word or verb.
a pronoun to which it refers or substitutes.
If the preceding is singular, the pronoun should also be. If it is plural, use a plural pronoun.
When an ambiguous pronoun precedes a personal pronoun, their numbers must match. To refer to a singular indefinite pronoun, use a singular pronoun. The singular pronoun "his or her" is commonly used.
The name of the car's sponsor is painted there. (singular)
To refer to a plural indefinite pronoun, use a plural pronoun.
Many of the vehicles are taking part in their debut race. (plural)
Singular and multiple forms are possible for some indeterminate pronouns.
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