Final answer:
Walking for at least 30 minutes every day is an appropriate response by the nurse to relieve constipation during pregnancy.
Step-by-step explanation:
Constipation is a common issue during pregnancy and can be managed through simple lifestyle changes. The appropriate response by the nurse would be option c. The client should be encouraged to walk for at least 30 minutes every day. Regular exercise, like walking, can help stimulate bowel movements and relieve constipation.
Drinking mineral oil (option a) is not recommended as it can interfere with nutrient absorption and have potential side effects. Eating red meat (option b) is not specifically indicated for constipation relief and should be consumed in moderation during pregnancy. Stopping prenatal vitamins (option d) is not a solution as these vitamins are important for the health of the mother and the developing fetus.