A nurse is collecting data from a client who has diabetes mellitus. The client is confused, flushed, and has an acetone odor on his breath. The nurse should anticipate an order for which of the following types of insulin to treat the client?

A. Detemir: Detemir is a long-acting insulin used for basal control of blood glucose and would not be appropriate in this acute situation where rapid insulin action is required. B. NPH: NPH insulin is an intermediate-acting insulin, which has a slower onset and is not ideal for immediate correction of high blood sugar or metabolic emergencies such as diabetic ketoacidosis (DKA) in this case. C. Regular: Regular insulin (short-acting insulin) is the preferred insulin to manage DKA and is given via IV for rapid correction of hyperglycemia. The presence of confusion, flushed skin, and an acetone odor on the breath strongly suggests DKA, which requires prompt treatment to lower blood glucose and correct the acidosis. D. Glargine: Glargine is a long-acting insulin used for basal blood sugar control and is not appropriate for the urgent treatment needed in DKA, as it has a slow onset and would not rapidly lower blood glucose.