Final answer:
During close vision, contract the ciliary body must the eye take to bring an object into focus (Option B).
Step-by-step explanation:
During close vision, several actions must occur in the eye to bring an object into focus. The lens of the eye needs to increase its curvature to become more converging, or more powerful. This is achieved by contracting the ciliary muscles, causing the lens to thicken.
As a result, the focal length of the lens is decreased, allowing light rays from the nearby object to be focused precisely on the retina. The pupil may also constrict to increase the depth of focus and reduce the amount of light entering the eye. This action is known as accommodation. Pupil dilation, in contrast, is not involved in the accommodation process for close vision.
Thus, the correct option is B.