SAT Grammar Quiz - Pronoun Agreement

Directions: The following sentences test your knowledge of pronoun agreement.
Some sentences are correct.
No sentence contains more than one error.
You will find that the error, if there is one, is present in the answer choices. Elements of the sentence that are not present in the answer choices will not be changed. In choosing answers, follow the requirements of standard written English.
If there is an error, select the one answer choice that must be changed to make the sentence correct.
If there is no error, fill in answer "No error."