The correct option is D even prime
We know that a simple event has only one outcome. When we throw a single dice, we can get 2 composite numbers (4 and 6), 3 prime numbers (2,3 and 5) and 3 even numbers (2,4 and 6). Hence, these are compound events. However, we can get only one even prime number, which is 2. Hence, the occurence of an even prime number is an example of a simple event.