Question

the probability of an event is 0.001. Which of the following best describes the event?
A The event will never occur.
B There is a small chance that the event will occur.
C The event is likely to occur.
D The event will definitely occur.

Answer 1

The answer you are looking for is B, there is a small chance of the event occurring. 

Answer 2

B. There is a small chance that the event will occur.
C and D are definitely wrong since 0.001 is equal to 0.1%, that's not even 1%.
But even though it's small, that doesn't mean it's impossible, just highly unlikely.
So the answer is B.