Which scenario is an example of speciation? A. Houseflies from a certain region migrate and interbreed with a different housefly population in a neighboring area.
B. A river separates members of a salamander population that used to occupy the same geographical area.
C. A disease ravages a large fox population, killing all members that did not have a genetic resistance to the disease.
D. Certain members of a human population have more offspring than others.