The Patient Has Been Using Crutches for the Past 2

The patient has been using crutches for the past 2 weeks.When she comes for her follow-up examination,she complains of tingling and numbness in her hands and upper torso.Which of the following is a possible cause of these symptoms?

A) The patient's elbows are flexed 15 to 30 degrees when using the crutches.
B) The crutch pad is approximately 5 cm (2 inches) below the patient's axilla.
C) The patient holds the cane 10 to 15 cm (4-6 inches) to the side of her foot.
D) The handgrip does not allow for elbow flexion.