Which of the following cannot be the probability of an event?

(A) 0.0
(B) 0.3
(C) 0.9
(D) 1.2

The answer is: (D) 1.2
Explanation
The probability of an event is always between 0 and 1 (including 0 and 1). So, 1.2 cannot be the probability of an event.