Is a Spinal Reflex Such as the Knee-Jerk Response Controlled

Multiple Choice

Is a spinal reflex such as the knee-jerk response controlled by the autonomic nervous system or by the voluntary nervous system?

A) Autonomic,because it happens automatically
B) Autonomic,because it does not involve the brain
C) Voluntary,because it involves skeletal muscle activity
D) Voluntary,because it involves both sensory and motor neurons
E) None of the above;it is neither voluntary nor autonomic.