The probability of a certain event occurring is calculated by the number of event over the total sample space. In this scenario, there is only one die with 6 faces. Therefore, the sample space is equal to 6.
Of the six faces numbered 1 to 6, there is only one five. The probability therefore of rolling a die and getting a five is equal to 1/6. This approach is the theoretical. Hence, the answer to this item is the first option, A Theoretical.