What fluid volume deficit would suggest a state of hypovolemia?

A significant drop in blood pressure combined with an increased heart rate is indicative of hypovolemia, which refers to a decreased volume of blood in the body. When a person experiences fluid volume deficit, the body's compensatory mechanisms will often respond by constricting blood vessels to maintain blood flow and pressure. However, if the deficit is severe, blood pressure will decrease due to insufficient blood volume to maintain adequate circulation.

The increase in heart rate occurs because the body attempts to compensate for the lower blood pressure and ensure adequate perfusion to vital organs. The tachycardic response is a direct result of the autonomic nervous system activating to support circulation in a state of diminished blood volume. This manifestation highlights how fluid volume deficits can lead to compromised hemodynamics, marking a state of hypovolemia.

The other options reflect scenarios that do not align with the physiological responses observed in hypovolemia, reinforcing the correctness of the chosen answer.