A Woman in the Active Phase of the First Stage

A woman in the active phase of the first stage of labour is using a shallow pattern of breathing,which is about twice the normal adult breathing rate.She starts to complain about feeling lightheaded and dizzy and states that her fingers are tingling.What should the nurse do?

A) Notify the woman's physician.
B) Tell the woman to slow the pace of her breathing.
C) Administer oxygen via a mask or nasal cannula.
D) Help her breathe into a paper bag.