Correct option is D
In a moving fluid, several forces can act simultaneously. These include:
- Inertia Force: This is the force due to the mass of the fluid accelerating or decelerating. It is governed by Newton's second law of motion.
- Viscous Force: This is the internal friction within the fluid due to its viscosity. It resists the relative motion between different layers of the fluid.
- Gravity Force: This is the force acting on the fluid due to gravity, which influences the flow in the vertical direction.
Since all of these forces can act in a moving fluid, the correct answer is "All of the options."
