Final answer:
B. "I'll nurse the baby whenever he shows signs of hunger."
The client has understood the instructions if she makes the statements "I'll nurse the baby whenever he shows signs of hunger" and "I'll contact my doctor if I experience severe nipple pain."
Step-by-step explanation:
When a nurse is providing postpartum instructions to a client who will be breastfeeding her newborn, there are certain statements that indicate the client has understood the instructions. The correct statements in this case are B and D. Statement B, "I'll nurse the baby whenever he shows signs of hunger," is correct because breastfeeding on-demand is recommended to ensure the baby gets enough milk. Statement D, "I'll contact my doctor if I experience severe nipple pain," is also correct because severe nipple pain could indicate a problem that needs medical attention.