The correct answer is C) The rate of doing work. Power is defined as the rate at which work is done, or the amount of work performed per unit of time. This is the fundamental definition of power according to the laws of physics. The other options are incorrect because: A) Force applied through a distance is the definition of work, not power. B) The rate of applying a force is a different concept, which is related to but not the same as power. D) Work performed through a distance is also the definition of work, not power.