Which sentence has a pronoun-antecedent error? A) Defrauding the general fund and blackmailing your enemies are not ways to be re-elected to public office. B) Hopefully everyone will be able to see his or her favorite piece of art when we tour the museum later this week. C) Everyone in the dog park was appalled at the man who disobeyed every dog park rule in a deliberately flagrant manner. D) Chris is adamant in his belief that anyone who puts forth the effort--no matter their age--is able to train and complete a half-marathon.

A pronoun-antecedent error, also known as pronoun-antecedent disagreement, is a common mistake in English, and it is made when the pronoun (antecedent) doesn't match or agree with the noun. In this case, the pronoun "anyone" is a singular indefinite pronoun; which means that the word "their" disagrees with the noun, and it should be replaced to "his or her".

The correct sentence would be:

Chris is adamant in his belief that anyone who puts forth the effort- no matter his or her age - is able to train and complete half-marathon.