The picture represents a gas, where particles are free-floating with no distinct arrangement, and they can move quickly in all directions.
The correct answer is "gas".
The description provided, stating that particles are free-floating with no distinct arrangement and can move quickly in all directions, corresponds to the characteristics of a gas. Therefore, the correct option to complete the statement is: a. gas
In a gas, the particles exhibit high kinetic energy and are not bound by specific arrangements or fixed positions. Instead, they move freely, colliding with each other and the container walls. This lack of a defined structure allows gases to fill the entire volume of their container, taking its shape.
Contrastingly, in a liquid, while particles are still free to move, they have a closer arrangement compared to gases, leading to a definite volume but no fixed shape. In a solid, particles are closely packed with a fixed structure, resulting in a definite shape and volume.
The option "none of the above" is not applicable in this context, as the described characteristics specifically align with the behavior of particles in a gas.
In summary, the picture depicts a gas because the particles are free-floating with no distinct arrangement and can move quickly in all directions.