The probability of an event is: 

A. The number of outcomes in the sample space divided by the number of outcomes in the event only if the outcomes in the event are equally likely. 

B. The number of outcomes in the sample space divided by the number of outcomes in the event whether or not the outcomes in the event are equally likely 

C. The number of outcomes in the event divided by the number of outcomes in the sample space only if the outcomes in the sample space are equally likely. 

D. The number of outcomes in the event divided by the number of outcomes in the sample space whether or not the outcomes in the sample space are equally likely. 

E. The number of outcomes in the sample space only if the outcomes are equally likely