During the operation, the surgeon electrically stimulated the right and left stellate ganglia. This stimulation resulted in: a. no change in coronary blood flow. b. an increase in ventricular rate and a decrease in atrial rate. c. a decrease in ventricular rate and an increase in atrial rate. d. a sustained coronary dilation in one of the partially occluded vessels. e. a sustained coronary constriction in one of the partially occluded vessels.