Answer:
Pair A. is not mutually exclusive
Pair B. is mutually exclusive
Pair C. is not mutually exclusive
Explanation:
First figure out whether something is mutually exclusive. Mutually exclusive means that if one is true, then the other must be false.
With pair A. you can see that you can roll a number that is both even and prime. 2 is both even and prime so pair a is not mutually exclusive.
With pair B. you know that a number is either even or odd, but it cannot be both, so pair B. is mutually exclusive.
With pair C. it is simple to find a number that is both even and smaller than 3. The number 2 is even and smaller than 3 so this pair is not mutually exclusive.