Reciprocal motion is a very important aspect of rehabilitation. Mr. Roxas has a weakness on his right leg. If a human moves his right leg, the left arm will accompany the movement of the right leg. That is what you call RECIPROCAL MOTION which is innate, natural and required to maintain balance. Mr. Roxas has weakness in his RIGHT LEG. If we put the cane on his right arm, The client will then be left UNSUPPORTED when he use his stronger leg [LEFT LEG] and stand with his weaker leg [RIGHT LEG] due to the fact that the opposite arm must accompany the movement of the opposite leg [RIGHT ARM]. In a more easier term, Always put the cane on the opposite of the weaker side. A is not correct because the client is NOT hemiplegic and will never be correct to reason out why the cane must always be at the opposite of the weaker side, it will always be due to reciprocal motion.