Joint Probability Question (from Schweser) following, situation, increase, occurred, interest

hanvinh

Schweser says the answer is A, but I think it's C. Isn't a joint probably a situation of "A" given "B", thus both have to occur?

Which of the following is a joint probability? The probability that a:

A)stock pays a dividend and splits next year.
B)company merges with another firm next year.
C)stock increases in value after an increase in interest rates has occurred.

Your answer: C was incorrect. The correct answer was A) stock pays a dividend and splits next year. A joint probability applies to two events that both must occur.