Final answer:
b) Accommodation is the visual process by which the lens changes its shape to focus images more clearly on the retina. Hence, option b) is correct.
Step-by-step explanation:
The process by which the lens changes its shape to focus images more clearly on the retina is called accommodation.
The ciliary muscles in the eye adjust the shape of the lens to change its focal length, allowing it to focus on nearby or far objects.
This mechanism is important for adjusting our vision between near and distant objects.