Which of the Following Statements Is Not Correct

Multiple Choice

Which of the following statements is not correct?

A) Two events A and B are mutually exclusive if event A occurs and event B cannot occur.
B) If events A and B occur at the same time,then A and B intersect.
C) If event A does not occur,then its complement A' will also not occur.
D) A union of events occurs when at least one event in a group occurs,
E) If all possible outcomes of an experiment are represented in a set,the set is considered exhaustive.