Which of the Following Statements Gives the Most Likely Explanation

Multiple Choice

Which of the following statements gives the most likely explanation for the presence of two very similar species of squirrels living on opposite sides of the Grand Canyon?

A) One squirrel traveled across the canyon and started a new population on the other side.
B) One squirrel traveled across the canyon and interbred with a different population on the other side.
C) Members of a single squirrel species were geographically separated by the formation of the canyon.
D) Members of two different squirrel species migrated from two different places to opposite sides of the canyon.