In the Labor and Delivery Department, the Nurse Notices That

In the labor and delivery department, the nurse notices that two women who are in labor are responding differently to their contractions. The first woman, who is having her first baby, has rated her pain as a "7," seems agitated, and has asked for pain medication. The second woman, who is having her third baby, has also rated her pain as a "7," but is calmer and says she does not need anything for pain at this time. What explains the differences in the outward responses to pain between these women?

A) Pain tolerance
B) Pain threshold
C) Nociception
D) Physiologic stress