Answer:
C. an obstetrician
Step-by-step explanation:
Catherine should most likely hire an obstetrician to assist her with childbirth. An obstetrician is a doctor who specializes on pregnancy, childbirth and postpartum. As this is a medically trained professional, this would be the person most likely to be able to help Catherine. It is important that Catherine hires someone who went to medical school, as these are the people who would be most able to help her if an emergency arises.