When Nicholas tosses a coin, he has a probability p of getting heads and a probability q = 1 − p of getting tails. In a single coin toss, let X denote the number of heads. If Var(X) = 3∕16, then the value of p is

(a) 1∕2

(b) 1∕4

(c) 3∕4

(d) either 1∕4 or 3∕4

(e) either 1∕2 or 3∕4