Monte Carlo simulation of a dice

Question

In MC simulation of a fair die the random numbers $x_n$ are generated between $0$ and $3$. Then which one denotes the event of obtaining $1$ in dice?

1. $0<x_n<\dfrac 16$
2. $0<x_n<1$
3. $\dfrac 13<x_n<1$
4. $0<x_n<\dfrac 12$

I'm stuck finding this solution. How are the random numbers generated and how do they represent any sort of event of rolling a dice? Help me to find this solution.