You Are Given the Probability That an Event Will Not $P \left( E ^ { \prime } \right) = 0.75$

Multiple Choice

You are given the probability that an event will not happen.Find the probability that the event will happen.​ $P \left( E ^ { \prime } \right) = 0.75$ ​

A) 0.4
B) 0.25
C) 0.35
D) 0.3
E) 0.45