The line about saving the day Harry must pass those guard dogs with three heads concludes that Sorcerer’s Stone was influenced by Ancient Greek mythological literature.
The complete question to the excerpt is: Read the excerpt from a summary of the contemporary novel Harry Potter and the Sorcerer’s Stone. To help save the day, Harry must get past a scary three-headed guard dog. In order to do this, he gets help from his good friends Hermione and Ron. They all have become close friends during the course of the school year. After they solve this challenge, they move on to the next part of their plan. Which line from the summary best justifies the conclusion that Harry Potter and the Sorcerer’s Stone was influenced by Ancient Greek mythological literature?
The three-headed dog was an ancient creature that was depicted in Ancient Greece, as Cerberus that guarded the doors of the underworld and kept the souls from leaving that place.
While in Harry Potter the dog is guarding the doors of the place at where the Sorcerer's stone is kept. He was the pet of Hagrid and was a powerful deadly creature.
Therefore, the three-headed guard dog links Greek mythology to Harry Potter.
Learn more about three-headed dogs here:
https://brainly.com/question/4186953
#SPJ1