A nurse is teaching about preventative measures to a female client who has chronic urinary tract infections. Which of the following instructions should the nurse include in the teaching?

A. Oral estrogen supplements may be used in postmenopausal women but are not the first-line preventative measure for UTIs. B. Soaking in a warm bath can increase the risk of infection by introducing bacteria into the urethra. C. Emptying the bladder every 6 hours is too infrequent; voiding every 2-4 hours is recommended to prevent urinary stasis. D. Adequate hydration flushes the urinary system, reducing the risk of bacterial growth and recurrent infections.