Answer: Option B
Explanation:
Simple event is an event where all the possible outcomes have the same probability.
Are the type of events that we can write as:
P = number of a given outcome/total posible outcomes.
Here we have 3 combined options (A, C and D) that, while in parts can be described in that way, not as whole events.
The correct option is B, where the probability of getting a given number in a dice is the number of times that the number repeats (1) divided the total number of options (6), P = 1/6 for all the numbers, so this is a simple event.