- A Mainly leg movement, leaving the arms and trunk unaffected
- B Breathing and all limbs (may require ventilator)
- C Mainly arm movement, sparing the lower limbs largely
- D Mainly bladder control, with limb function largely preserved
Correct answer: B. Breathing and all limbs (may require ventilator)
Explanation: The phrenic nerve (C3-C5) controls the diaphragm. Injury above C4 can affect breathing and all four limbs (quadriplegia).
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.