Three different core areas designed to protect an endangered beetle each have a buffer zone associated with them. in buffer zone a, the birth rate of the beetle is 0.04, and its death rate is 0.08. in buffer zone b, the birth rate of the beetle is 0.16, and the death rate is 0.2. in buffer zone c, the birth rate is 0.07, and the death rate is 0.05.
which of these buffer zones is most likely to be effective in protecting the beetle?

a. a
b. b
c. c
d. a and b would be equally effective, and better than c.
e. b and c would be equally effective, and better than a.