A skateboarder falls and lands directly on his buttocks and lower back. He does not feel too much pain and so he continues skating. After a couple of days, he begins experiencing right hip pain and notices his right foot and leg are rotated to the right. A doctor diagnoses muscle spasm.
Which of the following muscles is most likely causing the leg and foot rotation?.

A. quadratus lumborum
B. tibialis posterior
C. piriformis
D. adductor longus
E. sacrospinalis