Final answer:
Parasympathetic stimulation (option b) allows emptying of the bladder.
Step-by-step explanation:
The nervous response that allows emptying of the bladder is parasympathetic stimulation. The parasympathetic nervous system is responsible for promoting the contraction of the detrusor muscle in the bladder wall and relaxation of the involuntary internal urethral sphincter, which leads to bladder emptying. At the same time, the somatic nervous system inhibits the somatic motor neurons, causing the relaxation of the skeletal muscle of the external urethral sphincter.