Increased levels of angiotensin II have been detected in the blood of a patient with a hypertensive crisis. The pressor effect of angiotensin is associated with the:

• A. Activation of biogenic amine synthesis
• B. Hyperproduction of prostaglandins
• C. Stimulation of vasopressin production
• D. Contraction of arteriolar muscles
• E. Activation of the kallikrein-kinin system