One of the Best Ways to Prevent Heterotopic Ossification in the Quadriceps

One of the best ways to prevent heterotopic ossification in the quadriceps muscle is to do which of the following?

A) Cast the leg to prevent further movement and injury.
B) Don't stretch the muscle, but instead keep it in full extension.
C) Keep a sustained stretch with the knee maintained in 30° of flexion.
D) Keep a sustained stretch with the knee maintained in 120° of flexion.