Final answer:
b) Vitreous humor
The gel-like substance that fills the area of the eye posterior to the lens is known as the vitreous humor.
Step-by-step explanation:
The area of the eye posterior to the lens is filled with a gel-like substance known as vitreous humor. The eye is divided into two cavities: the anterior cavity and the posterior cavity. The anterior cavity, which includes areas such as the cornea, iris, and ciliary body, and is bounded by the lens, contains the aqueous humor, which is a watery fluid. On the other hand, the posterior cavity extends from the lens to the rear part of the eye, leading up to the retina, and is filled with the more viscous vitreous humor, which is responsible for maintaining the eye's shape and providing a pathway for light.