Which of the Following Describes the Most Effective Patient Position $\circ$

Which of the following describes the most effective patient position and use of the buoyancy of water for self-stretching the hamstrings?

A) In a buoyancy-supported supine position (flotation devices around the neck and hips) ,perform a unilateral straight-leg raise,lifting the leg to be stretched out of the water.
B) With a buoyancy device secured around the distal thigh of the leg to be stretched,stand on the opposite leg and hold on to the side of the pool for balance.Keep the knee relaxed as the buoyancy device lifts the thigh and flexes the hip.
C) Sit on the steps of a pool in waist-deep water,hips flexed to 90 ^$\circ$ ,with a buoyancy device secured around the ankle of the leg to be stretched.
D) With a buoyancy device secured around the ankle of the leg to be stretched,stand on the opposite leg and hold on to the side of the pool for balance.Allow the buoyancy device to lift the leg to the surface of the water with the knee extended.