Which of the following will lead to pulmonary vasodilation?

Baroreceptors are mechanoreceptors located in the carotid sinus and in the aoic arch. Their function is to sense pressure changes by responding to change in the tension of the aerial wall. The baroreflex mechanism is a fast response to changes in blood pressure Ref: guyton and hall textbook of medical physiology 12 edition page number:364,365,366