The main predators of field mice in a certain ecosystem are rattlesnakes and foxes. Suppose humans begin building neighborhoods in the ecosystem, driving out many of the indigenous rattlesnakes and foxes. What will most likely happen to the field mice's population?
A.
The population will occupy an entirely new niche.
B.
The population will decrease in size.
C.
The population will increase in size.
D.
The population will not be affected by the change.