This term means to prudishly remove erroneous, vulgar, obscene, or otherwise objectionable material before publication.

To expurgate

Explanation:

Expurgation, also known as bowdlerization, is a form of censorship which includes removal of material that is considered inappropriate or offensive from a text before its publication. This usually results in the text becoming weaker and losing its effectiveness. Bowdlerization is a pejorative term for expurgation, usually referring to the removal of lewd content from books. This term derives from the name of Thomas Bowdler, who expurgated Shakespeare's plays in order to make them appropriate for women and children.

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.