The population of a certain species of bird in a region after t years can be modeled by the functionP(t)= 1620/1+1.15e^-0.042t. What is the maximum population of the species in the region? , where t ≥ 0. When will the population reach 1,200?

A. about 10 years

B. about 28 years

C. about 35 years

D. about 42 years