Final answer:
Multifocal lenses are used in kids to correct myopia (nearsightedness) with a diverging lens and hyperopia (farsightedness) with a converging lens, making option c) the correct answer.
Step-by-step explanation:
Multifocal lenses can be used in kids primarily for two general reasons: myopia (nearsightedness) and hyperopia (farsightedness). Myopia is a condition where children can see objects that are near to them clearly but have difficulty seeing objects far away. To correct myopia, a diverging lens or concave lens is used to reduce the optical power of the eye, helping to focus light correctly onto the retina for distant objects.
On the other hand, hyperopia is when children can see distant objects well but struggle to see objects that are close. A converging lens or convex lens is used to increase the optical power of the eye for better focus on nearby objects. Thus, the correct answer to which of the given options lists the two general reasons for using multifocal lenses in kids is c) Nearsightedness and Farsightedness.