When a Woman Is Admitted to the Labor and Delivery

When a woman is admitted to the labor and delivery unit,she tells the nurse that she is anxious about delivery,the welfare of her infant,and how quickly she will recover.The nurse is aware that anxiety can affect labor by:

A) decreasing a woman's pain sensitivity.
B) reducing blood flow to the uterus.
C) increasing the ability to tolerate pain.
D) enhancing maternal pushing through greater muscle tension.