A nurse is caring for an adolescent client who has a long history of diabetes mellitus and is being admitted to the emergency department confused, flushed, and with an acetone odor on the breath. Diabetic ketoacidosis is suspected. The nurse should anticipate using which of the following types of insulin to treat this client?

A. Insulin detemir: Insulin detemir is a long-acting basal insulin used to maintain baseline insulin levels. It is not appropriate for immediate correction of hyperglycemia or diabetic ketoacidosis (DKA) because it has a slow onset of action. B. Insulin glargine: Insulin glargine is also a long-acting insulin that provides steady insulin levels over 24 hours. Like detemir, it is unsuitable for acute treatment of DKA due to its delayed onset and prolonged duration. C. NPH insulin: NPH insulin is an intermediate-acting insulin used for basal coverage but not for rapid correction of hyperglycemia. Its onset and peak times are too slow for emergency DKA management. D. Regular insulin: Regular insulin is short-acting and the insulin of choice for treating diabetic ketoacidosis. It can be administered intravenously for rapid onset, allowing effective reduction of blood glucose and correction of metabolic acidosis in acute settings.