Final answer:
The major structures involved in aqueous humor outflow are the ciliary body and trabecular meshwork.
Step-by-step explanation:
The major structures involved in aqueous humor outflow are the ciliary body and trabecular meshwork (option C).
The ciliary body is a muscular structure attached to the lens that helps to bend the lens, allowing it to focus light on the back of the eye.
The trabecular meshwork is a network of tissue located at the angle where the iris meets the cornea and helps to drain the aqueous humor out of the eye.