As Mean Arterial Pressure Increases, The_______ , Informing the Medulla

As mean arterial pressure increases, the_______ , informing the medulla oblongata that blood pressure has indeed increased.

A) number of neurons stimulated within the aortic arch increases
B) number of sympathetic neurons activated decreases
C) amplitude of the action potentials from the baroreceptors increases
D) frequency of action potentials from the baroreceptors increases
E) blood flow to the brain increases