A Population of Bison Was Separated by the Construction of a New

Multiple Choice

A population of bison was separated by the construction of a new interstate. The construction also separates bison east of the interstate from its natural predator, and bison west of the river from the primary source of water. Much time passes.
The horns of bison east of the interstate become less sharp than those west of the interstate. This is an example of:

A) Speciation
B) Divergent evolution
C) Convergent evolution
D) Succession
E) Parasitism