(Choose 1 answer)
A young pair of rabbits (one of each sex) is placed on an island. A pair of rabbits does not breed until they are 2 month old. After they are 2 month old they will produce 2 pairs of rabbits each month. Find the number of pairs of rabbits after 5 months.
A. 11
B. 13
C. 21
D. 20
6
