A biased coin with probability `p(0 lt plt 1)` of falling tails is tossed until a tail appears for the first time. If the probability that tail comes in odd number of trials is `(2)/(3)`, then `p` equals
A. `(1)/(4)`
B. `(1)/(3)`
C. `(3)/(4)`
D. `(1)/(2)`