The correct answer is: D. ideal fluid
An ideal fluid is a theoretical fluid that has no viscosity or resistance to flow. In other words, an ideal fluid is a fluid that flows without friction.
A fluid is a substance that can flow and take the shape of its container. Fluids can be either liquids or gases. Liquids are fluids that have a definite volume but no definite shape. Gases are fluids that have neither a definite volume nor a definite shape.
Viscosity is a measure of the resistance of a fluid to flow. The higher the viscosity, the more resistance the fluid has to flow. Water has a low viscosity, which means that it flows easily. Honey has a high viscosity, which means that it flows slowly.
A perfect solid is a theoretical solid that has no imperfections. In other words, a perfect solid is a solid that is completely rigid and has no defects.
A solid is a state of matter that has a definite shape and volume. Solids
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