Which of the following is a factor relating to nerve supply that contributes to continence?

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Continence relies on the nervous system keeping the pelvic floor muscles and sphincters taut and coordinated. The pelvic floor innervation provides the nerve signals that continuously tone the external urethral and anal sphincters and coordinate reflexes as the bladder fills. The pudendal nerve, in particular, plays a key role in controlling the external urethral sphincter and pelvic floor muscles, so intact innervation helps prevent leakage and supports proper timing of relaxation during voiding. Other factors like blood type, lung capacity, or hair color don’t influence continence through nerve supply, so they aren’t relevant to this aspect of continence.