a) Ronaldo is <u>a</u><u> </u> famous footballer.
b) That was <u>an</u><u> </u> important day in history.
c) He can play <u>the</u><u> </u> guitar well.
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The correct answer is his or her. Everyone is a singular indefinite pronoun; therefore, the singular form his or her agrees with the antecedent.
Yes I can!! bring it on!!