A population gorws according to the equation P(t)= 6000-5500e^-0.159t for t> or equal to 0, t measured in years. This population will approach a limiting value as time goes on. During which year will the population reach half of this limiting value?

(A) Second
(B) Third
(C) Fourth
(D) Eighth
(E) Twenty-ninth

What is a limiting value?