Answer:
The correct answer would be to "decrease the blood pressure".
Blood pressure refers to the pressure exerted by the circulating blood on the walls of the blood vessels.
The value of blood pressure depends on various factors such as exercise, food, water intake, mental status et cetera.
The decrease in the amount of water in the blood decreases the volume of plasma present in the blood due to which the blood pressure decreased significantly.
Other factors like blood loss, drugs, hormonal dis-balance et cetera can also decrease the blood pressure.