Normal Diploid Somatic Body Cells of the Mosquito Culex Pipiens

Normal diploid somatic body cells of the mosquito Culex pipiens contain six chromosomes.Assuming that all nuclear DNA is restricted to chromosomes and that the amount of nuclear DNA essentially doubles during the S phase of interphase,how much nuclear DNA would be present in metaphase I of mitosis? Note: Assume that the G1 nucleus of a mosquito cell contains 3.0 × 10^{- 12} grams of DNA.

A) 12 × 10^-12 g
B) 1.5 × 10^-12 g
C) 0.75 × 10^-12 g
D) 3.0 × 10^-12 g
E) 6.0 × 10^-12 g