A client with heart failure asks the nurse about the reason for taking enalapril maleate. The nurse would explain that the medication is prescribed for which of the following reason
选项：

A:Lower the blood pressure by increasing peripheral vasoconstriction.
B:Lower the heart rate by slowing the conduetion system.
C:Block the conversion of angiotensin Ⅰ to angiotensin Ⅱ.
D:Increase myocardial contractility, thereby improving cardiac output.