Correct answer choice is :
A) Accommodation
Step-by-step explanation:
The method by which the eye improves optical power to keep a clear vision of an object as it moves near. Accommodation normally acts like a reflex, including as part of the accommodation-vergence reflex, but it can also be consciously managed. Mammals, birds, and snakes vary the visual power by converting the form of the elastic lens using the ciliary body. Fish and amphibians vary the pressure by increasing the distance within a rigid lens and the retina with tissues.