According to Bernoulli's Principle, when fluid flow increases in a system, the pressure:

Bernoulli's Principle states that in a fluid flow, an increase in velocity occurs simultaneously with a decrease in pressure or potential energy. This principle arises from the conservation of energy in a flowing fluid, where the total mechanical energy remains constant.

When the speed of the fluid increases, the kinetic energy of the fluid particles rises. Since energy must be conserved, this increase in kinetic energy results in a reduction of pressure energy within the fluid. The relationship indicates that if the velocity of the fluid increases, it must compensate for this by lowering the pressure.

In practical terms, this can be observed in various fluid dynamics applications, such as in a Venturi effect, where fluid flows through a constricted section of pipe and accelerates, leading to decreased pressure in that area. Thus, the correct understanding of Bernoulli's Principle is reflected in the answer that indicates pressure decreases with an increase in fluid flow velocity.