Refer to the Table

Refer to the table.
The table shows the number of species of lizards present in the tropics, the subtropics, and the temperate zone over the last fifty million years. Of the three broad categories of hypotheses that have been proposed to explain latitudinal gradients (diversification rate, diversification time, and carrying capacity) , these data best fit which hypothesis?

A) Diversification rate
B) Diversification time
C) Carrying capacity
D) Combination of diversification rate and diversification time