Data Mining is the technique of extracting useful data fro a set of given data
Explanation:
The technique which is used to make prediction is (a)Data Mining .
In the above question the data mining technique used is the Prediction Method.This method is used to understand the response and a predictor variable.
For example, in the above question the demographic information of the consumers such as income, product preference,buying pattern, etc is studied in order to offer discount on product A.