An initial population of 7 chipmunks increases by 6% each year. If the function f(x) = ab^x models this situation, which function could you use to find the population after 8 years?
A) f(x) = 8(1.06)^7
B) f(x) = 7(1.06)^8
C) f(x) = 7(0.06)^8
D) f(x) = 8(0.06)^7