The correct answer is a. True.
High development of the agonist-antagonist function is important for the development of skilled and coordinated movement as the antagonists control speed, the force and range of the agonist action. This holds true for the main muscles that are involved and all the stabilizers of activated joints. The stabilizer muscle holds the non-moving parts of the joints at correct place so as to allow the movement of the muscle at the other end. There should be a proper balance between these two opposing muscles. A balanced well aligned body can proportionally develop the agonists on one side of the joint with antagonists on other side of the joint.