Final answer:
The woman is likely experiencing active labor, where the cervix is fully dilated to 10 cm and the baby is being expelled from the uterus.
Step-by-step explanation:
During the dilation stage of labor, uterine contractions push the baby's head against the cervix, causing it to dilate. This stage lasts until the cervix has dilated to about 10 cm, which is needed for the baby's head to fit through. In the second stage of labor, the baby is expelled from the uterus through the vaginal canal, with the mother bearing down during contractions to push the fetus out. The last stage is the passage of the placenta after the baby has been born. In this scenario, with the contractions occurring 2-3 minutes apart, lasting 80-90 seconds, and with the cervix already dilated to 9 cm, the woman is likely experiencing active labor (option b).