Classical probability is also known as
A. A prior probability
B. Mathematical probability
C. Laplace probability
D. All of the above

Hint: Probability is classified into many types based on its perspectives. Some important types are classical, relative and subjective. We need to briefly discuss classical probability, and we can see that it has two other different names, theoretical and a priori probability. Comparing this with the given options we must select the correct option.

Complete step-by-step answer:
First let’s discuss about what is classical probability
There are different kinds of probability based on the perspectives. Out of which we can see about the three different types.
There are three types of probability, namely, classical, relative and subjective.
Classical probability is something general or the probability learnt in the very beginning.
It works on assumptions of the likely outcomes of an event.
For example, rolling a fair die is also an example of classical probability as we may get the outcomes as $1,2,3,4,5$ and $6$ .
It is mostly theory based; it helps in making assumptions of the outcomes whenever an event takes place. Hence it is also known as theoretical probability or priori probability.
Now let’s discuss the given options.
Mathematical probability is not considered as a type of probability. Hence, it’s not a valid option
Same way, Laplace probability is also not considered as a valid option.
Since classical probability is known as theoretical or priori probability, the correct option is (a)

So, the correct answer is “Option A”.

Note: Many students tend to select the second option as students may think that it is mathematical as probability is a topic related to mathematics. It is a silly mistake which most of the students make. But Classical probability is also known as priori or theoretical probability.