47. If the number of individual is N, and the carrying capacity is K, and dN/dt as the rate of population growth. Base on the formula, dN/dt = rN(K-N)/K, the rate of population growth less than zero as
(A) carrying capacity approaches zero.
(B)the age-specific fertility rate approaches zero.
(C)the per capita growth rate declines.
(D)the population size approaches the carrying capacity.
(E) the population size over the carrying capacity.