Which One of the Following Statements About the Evolutionary Divergence

Which one of the following statements about the evolutionary divergence of horses in North America is false?

A) Most changes are seen as adaptations for life in grassland habitats.
B) The general trends during horse evolution are increase in body size,lengthening of limbs,reduction of digits on both sets of limbs,and tooth development for a grazing life style.
C) Global climate change during the Miocene and early Oligocene epochs caused many of the changes in the evolution of horses.
D) Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages.
E) Living lineages of horses show much less diversity than existed in the past.