Matching the vision defects with the appropriate corrective lenses: A. Myopia (Nearsightedness) requires a diverging lens to correct, which is a concave lens. A bi-concave lens is a type of concave lens. (A-2) B. Hypermetropia (Farsightedness) requires a converging lens to correct, which is a convex lens. A bi-convex lens is a type of convex lens. (B-1) C. Presbyopia is age-related farsightedness, requiring a converging lens (convex) for near vision. While single convex lenses or bifocals/ varifocals are common, a concave-convex lens can be manufactured with a positive power to act as a converging lens suitable for correcting presbyopia. (C-4 is the best fit among the options). D. Astigmatism is caused by an irregularly shaped cornea or lens and requires a cylindrical lens to correct the uneven focusing of light. (D-3)