A 29 years old female presents to you with difficulty in walking and climbing stairs for the last 3 weeks. Physical examination reveals a waddling gait, with her trunk swaying from side to side towards the weight bearing limb. When she stands on her right leg, the pelvis on the left side falls; but when she stands on the left leg, the pelvis on the right side rises. Which of the following nerves is injured?
Right femoral nerve Right inferior gluteal nerve Right obturator nerve Right superior gluteal nerve