Which of the following reflects the first step of effective communication? a. jessica researched the topic that is going to be discussed at today’s group meeting. b. ken is arguing about the grade he received from his teacher. c. july is giving a lecture about 14th century art. d. melanie is writing a thesis statement.

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.