Gregor J. Mendel is the father of Genetics. He conducted various experiments by mating pea plants of varying characteristics. He then calculated the number of variants produced by mating and finally calculated the probability of transmission of a particular character. This approach is called:
practical approach to probability.
In practical approach to probability, the experiments are actually performed and the data is recorded. The data recorded is then used to calculate probability. As Mendel performed all the mating experiments to record the data, this approach is a practical approach to probability. So, the correct option is B.