The Primary Fluid Flow Principle of Circulation Is Based on All

Multiple Choice

The primary fluid flow principle of circulation is based on all of the following except a fluid:

A) flows only when a pressure gradient is absent.
B) does not flow when the pressure is the same in all parts of it.
C) flows only when its pressure is higher in one area than in another.
D) flows always from its higher-pressure area toward its lower-pressure area.