The Prisoner of Azkaban Chapter 8 : Why do you think Lupin ignores Harry's worries about Snape?

Question 3 of 10 points which sentence is an example of chronological structure in "the city without o a. without daily pumping, manhattan's subway tunnels would be flooded o b. some time in the next 100,000 years, glaciers will cover all of manhattan o c. central park has a garden that houses plants mentioned in shakespeare's plays. o d. if flooding were to go unchecked, steel support beams in buildings would rust

It's to know your purpose before you read something because a purpose can:

Iam giving 10 points and ! need asap