Final answer:
For a client with type 2 diabetes who increases their physical activity, the dosage of their diabetes medication may need to be lowered to avoid hypoglycemia.
Step-by-step explanation:
If a client with type 2 diabetes takes an oral medication for diabetes, then the dosage may need to be adjusted based on changes in physical activity. When physical activity increases, it can enhance insulin sensitivity in the body and facilitate better glucose uptake by the muscles, which might lower blood glucose levels. Due to these physiological changes, it's common for the dosage of medication to be reduced to prevent hypoglycemia. Therefore, the correct answer is: b. May need to be lowered when increasing physical activity.