Final answer:
An appropriate response to a woman's comment about her worries regarding a cesarean birth is to ask her about her feelings regarding the procedure.
Step-by-step explanation:
An appropriate response to a woman's comment that she is worried about having a cesarean birth is option b. "What are your feelings about having a cesarean birth?" This response shows empathy and allows the woman to express her concerns and fears about the procedure. It is important to acknowledge and validate her emotions rather than dismiss them or provide general reassurance.