The correct answer is;
Each of the girls had to show they could make ten baskets in a row.
When an indeterminate pronoun is the antecedent of a personal pronoun, they must coincide in number. Use a singular pronoun to refer to a singular indefinite pronoun. It is accepted that "his or her" is a singular pronoun.
Each car's sponsor's name is painted there. (singular)
Use a plural pronoun to refer to a plural indefinite pronoun.
Several of the cars are competing in their first race. (plural)
Some indefinite pronouns are capable of singular or plural forms. Examine the sentence context to determine whether an indefinite pronoun is singular or plural.
Some of the equipment's packaging was still attached to it. (singular)
Some of the teams taking part in the competition were still looking for their equipment. (plural)
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