What does it mean if the probability is 1/6 that a 5 will be rolled on a number cube?

A.
There are 6 chances that a 5 will be rolled.

B.
A 1 will be rolled once in 6 rolls.

C.
If a number cube is rolled 6 times, a 5 will always be on top one time.

D.
There is 1 chance in 6 that a 5 will be rolled.