For regression problems, the predicted value must be a numerical quantity. This numerical quantity is usually continuous.
In option A, you are predicting a numerical value. Therefore, this will fall under the category of regression problem.
In option B, specific classes are predicted. In this case, the classes would be: the set of all countries
In option C, again, the predictions being made are of specific classes and not numerical quantities. Here, classes are { will increase, will_not_increase }
In option D, the specific style/genre of the movies is to be predicted. Here, the classes would be { Comedy, tragedy }
