What point of view does the author express in the "Inescapable Night" section of "What Killed the Dinosaurs?" What Killed the Dinosaurs?

A. The earth warmed so much after the asteroid strike that many dinosaurs couldn't handle the heat and died.
B. The spread of Arctic ice and cold temperatures following the asteroid strike trapped and killed many dinosaurs.
C. The falling temperatures from the darkness caused by the asteroid strike were a big reason the dinosaurs became extinct.
D. The darkness caused by the asteroid strike was the sole cause of the extinction of dinosaurs.