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

A. B. –1.5

C. 15% D. 0.7

We know that probability of an event (E) is either greater than or equal to 0 and always less than or equal to one. This shows that the probability of an event can never be negative or greater than 1.

Hence,

Out of the given alternatives, -1.5 cannot be a probability of an event as it is negative which is not possible.

Hence, (B)