The stem cells in the epidermis are:() A: basal cells B: spinous cells C: Langerhans cells D: Merkel cells E: keratinocytes

A 68-year-old man is admitted to the hospital due to severe back pain. Radiologic examination reveals severe osteoporosis of the vertebral column, with compression fractures to vertebrae L4 and L5. Which of the following parts of the vertebrae are most likely to be fractured in this patient? A: Spinous process B: Vertebral bodies C: Transverse process D: Superior articular process E: Intervertebral disc