Final answer:
The form of matter with properties of viscosity, surface tension, and buoyancy is a liquid. Particles can move around freely in the fluid phases of matter, which include liquids, gases, and plasma. option a is correct.
Step-by-step explanation:
The form of matter that possesses the main physical properties of viscosity, surface tension, and buoyancy is a liquid. These properties are significant because they indicate a fluid's resistance to flow, the cohesive force at the surface of a fluid, and the ability of an object to float or sink in a fluid, respectively.
Gases are less viscous than liquids and do not exhibit surface tension in the same way, while solids resist shearing forces entirely and do not flow, therefore do not exhibit viscosity and buoyancy in the same context as fluids. Plasma, being highly ionized and having properties distinct from ordinary solids, liquids, and gases, notably does not exhibit these properties in the conventional sense. Therefore, the answer is option a. liquid.
In terms of phases of matter where molecules can change their positions, the correct options are liquid, gas, and plasma. Molecules in these states are not fixed in place as they are in a solid. Instead, they can move around freely which is characteristic of fluids. Thus, option c. liquid, gas, plasma is the correct answer to this question.