Final answer:
The correct placement of the cuff weight to require the greatest work from the biceps muscle is around the wrist, as this increases the moment arm and the required muscle force to lift the same weight.
Step-by-step explanation:
The placement of a cuff weight on the forearm to require the greatest work from the biceps muscle to lift the weight would be around the wrist. This location increases the moment arm for the force of the weight. The moment arm is the perpendicular distance from the pivot point (the elbow) to the line of action of the force. By positioning the weight further from the pivot point, you increase the torque that the weight produces, which requires the biceps muscle to exert more force to lift the same weight. The correct answer to the question is option B: Around the wrist.
Considering the biomechanics of the arm, if the biceps muscle is attached close to the elbow, the distance from the pivot is reduced, and hence the leverage effect is lower, meaning less force is needed by the muscle for movements around the elbow. As the forearm lifts a weight, the torque placed on the arm from the weight increases with a longer moment arm, and the countering torque created by the bicep muscle must also increase.