Which of the Following Provides the Best Definition of Mental

Which of the following provides the best definition of mental discipline?

A) Teaching as a profession with certain methods, techniques, and materials to promote student learning
B) The educational theory that building the powers of the mind through memorization, practice, and recitation develops character and learning
C) The view that intellect, will, and emotions can be trained by a uniform procedure of mental discipline and drill
D) None are correct