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Dinosaurs died out around 65 million years ago ___________. The most accepted one is that a giant asteroid crashed into earth around this time and caused catastrophic changes to the climate. It was probably freezing cold and the dinosaurs could not adapt to the new weather conditions.

  • A.There are several theories about why this happened
  • B.There were more than 700 different types of dinosaurs
  • C.Dinosaurs were reptiles which lived millions of years ago
  • D.They lived in the Mesozoic period ? known as the "age of reptiles"

Answer: A

Correct answer: There are several theories about why this happened

The sentence after the blank begins the most accepted one, and one needs a plural noun to be selected from. Only the keyed option supplies it, and this in it refers back to the dying out.

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