A nurse is teaching a group of unlicensed assistive personnel about urinary tract infections (UTI) in clients who are female. When describing why females have higher rates of UTIs than males, which of the following explanations should the nurse use?

Choice A rationale The normal pH of freshly voided urine is slightly acidic, generally ranging from 4.6 to 8.0, with an average of about 6.0, which typically inhibits bacterial growth. Female anatomy does not inherently lead to more alkalotic urine. The misconception that alkaline urine promotes UTIs does not explain the anatomical reason for higher female prevalence. Choice B rationale Bladder capacity is not significantly different between males and females in a way that explains the differential risk for UTIs. Normal adult bladder capacity is approximately 300 to 500 mL in both sexes. Reduced capacity can contribute to frequency, but it is not the primary anatomical reason for increased UTI incidence in females. Choice C rationale The shorter length of the female urethra, which averages about 3 to 4 cm compared to the male urethra's 20 cm, is the primary anatomical reason for the higher incidence of UTIs. This proximity of the urethral meatus to the anus allows for easier ascent of colonic bacteria, such as E. coli, into the bladder. Choice D rationale The detrusor muscle is the smooth muscle layer of the bladder wall responsible for contraction during micturition. There is no inherent difference in the strength or function of the detrusor muscle between healthy males and females that would predispose females to higher rates of urinary tract infections.