Which revision best corrects the pronoun agreement error in the following sentence? "Every student must submit their essays by Friday."

✓ Correct Answer: Option B

'Every student' is singular, so the pronoun referring to it must also be singular. 'Their' is plural. 'His or her' correctly provides a singular, non-gender-biased pronoun. 'Its' is for inanimate objects; 'his' is gender-biased.