What is the antecedent of the pronoun in the parentheses?

Both of the skydivers had brought (his, their) own parachutes and safety gear in preparation for tomorrow’s jump.]]> Is the antecedent singular or plural?

Both of the skydivers had brought (his, their) own parachutes and safety gear in preparation for tomorrow’s jump.]]> Both of the skydivers had brought their own parachutes and safety gear in preparation for tomorrow's jump. Type the correct pronoun into the box, then submit it and say the sentence.

Both of the skydivers had brought (his, their) own parachutes and safety gear in preparation for tomorrow’s jump.]]>