A nurse is teaching the partner of a client who had an acute myocardial infarction (MI) about the reason blood was drawn from the client. Which of the following statements should the nurse make regarding cardiac enzymes studies?

Rationale: A. Cardiac enzyme tests indicate myocardial injury but do not pinpoint the exact location of the infarct; imaging or ECG is required for localization. B. Cardiac enzymes, such as troponin and creatine kinase-MB (CK-MB), are released into the bloodstream when myocardial cells are damaged. Their levels correlate with the extent of cardiac tissue injury, helping providers assess severity and guide treatment. C. Pulmonary congestion is assessed via physical examination, chest X-ray, or echocardiography, not cardiac enzyme levels. D. Structural assessment requires echocardiography or other imaging, not blood enzyme studies.