Final answer:
The client should avoid alcohol while taking metformin.
Step-by-step explanation:
The correct answer is d) I'll avoid alcohol while on this medication. Metformin is a medication commonly prescribed to manage type 2 diabetes. It helps to lower blood glucose levels by reducing the amount of glucose produced by the liver and increasing the sensitivity of cells to insulin. Alcohol can interact with metformin and increase the risk of lactic acidosis, a potentially serious side effect. Therefore, it is important for the client to avoid alcohol while taking this medication to ensure their safety.