If from each of the three boxes containing 3 white and 1 black, 2 white and 2 black, 1 white and 3 black balls, one ball is drawn at random, then the probability that 2 white and 1 black balls will be drawn, is
A. `(13)/(32)`
B. `(1)/(4)`
C. `(1)/(32)`
D. `(3)/(16)`