During the Last 65 Million Years, Which of the Following

Multiple Choice

During the last 65 million years, which of the following occurred?

A) The climate first warmed, then cooled, and most recently became variable.
B) The climate underwent a constant cooling trend, with decreasing variability.
C) The climate underwent a constant warming trend, with some recent variability.
D) The average climate did not change but the variability went down.