Final answer:
The most effective response from a nurse to a 4-year-old about an upcoming IM injection is to honestly say that 'It might hurt a little,' to help build trust while acknowledging the child's feelings.
Step-by-step explanation:
The nurse's most effective response to a 4-year-old who is tearful about receiving an IM injection is c) It might hurt a little. Being honest with the child helps build trust and also prepares them for the experience without causing undue fear. A response that is overly optimistic or dismissive of the child's concern, such as "It won't hurt at all" or "You're a big kid; you can handle it," may lead to distrust if the child's experience differs from what was promised.
It's important for healthcare professionals to provide comfort and assurance to pediatric patients. Saying "I promise it will be quick" can be a part of the approach, but it should be combined with a gentle acknowledgment of the child's concern, reassurance of support, and possibly a distraction technique during the procedure. This balanced approach can help alleviate some of the child's anxiety while also being truthful about what to expect.