Which of the following statement is correct about rate of diffusion of liquids?

The rate of diffusion of liquids is higher than that of solids. 

The correct answer is option 3. The rate of diffusion of liquids is higher than that of solids.

Diffusion is the process by which particles or molecules move from an area of higher concentration to an area of lower concentration. The rate of diffusion is influenced by various factors, including the nature of the substance and the medium through which it is diffusing.

In the context of the options provided, liquids generally have a higher rate of diffusion compared to solids. This is because the particles in liquids are typically less closely packed than those in solids, allowing for greater mobility. In solids, particles are held in a fixed position, making it more challenging for them to move and mix with particles in neighboring areas. Therefore, the correct statement "The rate of diffusion of liquids is higher than that of solids" reflects the general behavior observed in the diffusion of these two states of matter.