Final answer:
All outcomes in a probability distribution must have probabilities greater than 0.
Step-by-step explanation:
In a probability distribution, all outcomes must have probabilities > 0. This means that every possible outcome has a chance of occurring. If an outcome has a probability of 0, it means that it cannot happen.
For example, if you roll a six-sided die, the probability of getting a 7 is 0, because it is not a possible outcome. The probabilities of getting each number from 1 to 6 are all greater than 0.
Therefore, the correct answer is B. have probabilities > 0.