问题如下：
Which of the following statements is most accurate regarding to mutually exclusive events?
选项：
A.The sum of the probabilities of mutually exclusive events is 1.
B.Mutually exclusive events contain all possible outcomes.
C.Mutually exclusive events can occur only one at a time.
解释：
C is correct. The term mutually exclusive means that only one event can occur at a time.
老师，请问C选项是什么意思
