Diffusion: which of the following statements is correct?

The correct answer is A. It is a passive process that occurs as a result of the random movement of particles, and it helps to equalize the concentration of substances in a system. For example, if a container of gas is opened, the gas molecules will move from the container to the surrounding air, diffusing until the concentration of the gas is the same throughout the system. Answer B. is incorrect because diffusion is the opposite, the movement of substances from an area of higher concentration to an area of lower concentration. Answers C. and D. are incorrect because diffusion is a random process and does not follow a specific pattern or path.