Make sure the when you the incorrect pronoun it change it to a another pronoun. Example:Everyone needs to floss and brush their teeth twice a day.
You circle their it’s a pronoun. Change their to his/her his and her are pronouns.

explanation: the line "to save the day, harry must get past a scary three-headed guard dog" from the summary best justifies the conclusion that harry potter and the sorcerer’s stone was influenced by ancient greek mythological literature. the three other choices had nothing to do with ancient greek literature - and the words "three-headed guard dog" are what makes that choice the correct answer.