The correct option is B.
The size of the particles present in mixtures can be used to classified them. A mixture can be classified as a solution, suspension or a colloid based on the size of its largest particles. The particle sizes of solutions ranges from 0.1 to 2.0 nano meter, that of suspensions is usually greater than 1000 nano meter, so they are visible to the naked eyes. The particles size of colloids ranges from 1 nano meter to 1 micrometer.