Read the sentence.
What is the agreement error in this sentence?
No one could believe their luck when the owner of the
restaurant offered free dessert to all.
O The pronoun "their" does not match its antecedent in
number
O The pronoun their does not match its antecedent in
person
O The pronoun their" does not match its antecedent in
case or number
O The pronoun "their" does not match its antecedent in
number or person.