Answer:
The correct answer is option A, Blood pressure would drop during a heartbeat
Step-by-step explanation:
When the arteries get constrict, the walls of arteries reduces the space/volume with in the arteries which causes blockage for a very minute time period. When the flow is blocked the blood pressure increases, while when the walls are released the pressure reduces but the flow increase.
This process is also refered to as Vasoconstriction and it is a normal process which stabilizes the blood pressure.