Answer:
D. 8/11
Explanation:
why ?
the sum of the probabilities of all possible outcomes of an experiment must always be 1.
because there always has to be an outcome - one of the many possibilities.
the reality has to be part of this list of possibilities, and so, their total sum is 1 : the sure event.
the probability of A is 1/11.
of B is 1/11.
of C is 1/11.
A + B + C + D = 1
1/11 + 1/11 + 1/11 + D = 1
3/11 + D = 1
D = 1 - 3/11 = 11/11 - 3/11 = 8/11