Final answer:
The nurse will instruct Maria's parents to 'Use a gentle touch when cleaning the incision' to prevent disrupting the site and to promote healing while minimizing the risk of infection.
Step-by-step explanation:
The nurse teaches Jose and Blanca how to care for Maria's incision site after discharge from the hospital. Instruction "B" is what the nurse will likely discuss with Maria's parents: "Use a gentle touch when cleaning the incision." It's important to handle the incision delicately to prevent disrupting the healing tissue and causing additional pain or harm to Maria. This advice aligns with post-operative care best practices that aim to minimize the risk of infection and promote healing. The need for gentle care is underscored by clinical scenarios where increased redness, swelling, and pain at an incision site may indicate possible infection, which requires attention to ensure recovery.