To lift a 20-pound box from the floor with proper body mechanics: __________.
a. Bend at the waist. Keep the arms extended to hold the box away from the body.
b. Bend at the knees and hips. Keep the back aligned. Hold the box close to the body.
c. Bend at the waist. Pull the box into the chest with the muscles of the arms.
d. Use the muscles of the back to lift.
e. None of these descriptions is correct.