Final answer:
Demonstrating the injection technique is the most effective way for a nurse to teach a client about self-injection of insulin, as it provides a clear visual guide and practical experience. The Correct Answer is Option. B.
Step-by-step explanation:
While preparing to teach a client about self-injection of insulin, the nurse's action that would increase the effectiveness of the teaching session is demonstrating the injection technique. This hands-on approach is beneficial because it provides a visual and practical example of how to perform the procedure correctly.
It's also important to ensure that the client understands the purpose of the insulin injection, which is to help transport and store glucose, thereby helping to decrease blood glucose levels after consuming a large or high-glucose meal, rather than to increase them before a meal.