Which of the Following Is True of the Earth's Glacial

Multiple Choice

Which of the following is true of the Earth's glacial history?

A) The Earth's climate has remained relatively consistent throughout geologic time.
B) An episode of widespread glaciation at the end of the Proterozoic resulted in the Great Oxygenation Event.
C) There was a time called Snowball Earth when the Earth's surface was almost entirely covered in glacial ice.
D) Increased glaciation at the end of the Cretaceous was partly responsible for the extinction of the dinosaurs.