6. Suppose the population of deer in a state forest is given by the function D(t) = 750 + 150 cos

t is measured in years since 2000. Once the deer population reaches a maximum number, how ma

take the population to reach a maximum again?

A. 2 years

B. 3 years

C. 4 years

D. 5 years

A. 2 years

B. 3 years