The Mechanism Responsible for the Size Principle Involves

The mechanism responsible for the size principle involves

A) larger motor neurons that innervate the greatest number of muscle cells and reach threshold easier than smaller neurons.
B) smaller motor units that contain the greatest number of muscle cells and reach threshold easier than larger neurons.
C) smaller sympathetic neurons that contain the least number of muscle cells and reach threshold easier than larger neurons.
D) larger sympathetic neurons that contain the greatest number of muscle cells and reach threshold easier than smaller neurons.
E) smaller motor neurons that innervate the least number of muscle cells and reach threshold easier than larger neurons.