In the Asteroid Impact Theory of the Extinction of the Dinosaurs

Multiple Choice

In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago,the dinosaurs (and over half of all the other species on Earth at that time) died off largely because

A) of injuries suffered from direct hits of pieces of the asteroid or comet.
B) dust injected into the stratosphere from the impact absorbed visible light from the Sun,causing global temperatures to plummet.
C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer.
D) the impact caused massive earthquakes and volcanic activity worldwide.
E) dust settled on the leaves of plants,making them inedible,so the animals died of starvation.