3-Methylpentane on monochlorination gives four possible products. The reaction follows a free radical mechanism. The relative reactivities for replacement of hydrogen are $$3^\circ\colon2^\circ\colon1^\circ=6\colon4\colon1$$. Relative amounts of A, B, C and D formed are

A

$$6/31,\ 16/31,\ 6/31,\ 3/31$$

B

$$16/31,\ 6/31,\ 6/31,\ 3/31$$

C

$$6/31,\ 16/31,\ 3/31,\ 6/31$$

D

$$6/31,\ 3/31,\ 6/31,\ 16/31$$