According to the excerpt, how does Karl Schwarzschild use Einstein’s ideas to draw a conclusion?

Karl Schwarzschild was a German physicist and also an astronomer. He is regarded as the father of astrophysics.

Albert Einstein was also German-born theoretical physicist. He was known for developing the theory of relativity.

Karl Schwarzschild used Einstein's ideas about space bending to reach a conclusion that black holes are possible when stars spin at a high speed and eventually collapse.

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.