Refer to the figure.
Which of the following hypotheses for the global latitudinal gradient in species is not supported by the figure?

A) The tropics and temperate regions have had similar speciation rates, but extinction rates have been lower in the tropics.
B) The tropics and temperate regions have had similar extinction rates, but speciation rates have been higher in the tropics.
C) The tropics have had more time for diversification than temperate regions have.
D) Temperate regions have experienced lower diversification rates than the tropics have.