74. 下列有關靜脈麻醉劑的心血管作用，何者正確？
 1. Midazolam increases systemic vascular resistance.
 2. Phenylephrine-induced contraction of the canine pulmonary artery is attenuated by fentanyl.
 3. Concurrent administration of midazolam and fentanyl results in a significant decrease in systemic vascular resistance.
 4. Fentanyl has no effect on sympathetic activity, but enhances parasympathetic tone.
(A) 僅1+2
(B) 僅2+3
(C) 僅3+4
(D) 僅1+2+3
(E) 僅2+3+4