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.Possible causes of these symptoms are:

A) The patient's elbows are flexed 15 to 30 degrees when using the crutches
B) Crutch pad is approximately 2 inches below the patient's axilla
C) Patient holds the cane 4 to 6 inches to the side of her foot
D) Hand grip does not allow for elbow flexion