To solve this problem, we need to identify what holds the transparent lens in the human eye in place. Let's analyze the options:$\newline \bullet$Option 1: Smooth muscles attached to the iris$\newline$ - The iris contains smooth muscles, but they are responsible for controlling the size of the pupil, not holding the lens.$\newline \bullet$Option 2: Ligaments attached to the iris$\newline$ - Ligaments are not attached to the iris for holding the lens.$\newline \bullet$Option 3: Ligaments attached to the ciliary body$\newline$ - The lens is held in place by suspensory ligaments, also known as zonules, which are attached to the ciliary body.$\newline$ - These ligaments help in adjusting the shape of the lens for focusing.$\newline \bullet$Option 4: Smooth muscles attached to the ciliary body$\newline$ - The ciliary body contains smooth muscles, but they are involved in changing the shape of the lens, not directly holding it.$\newline$Therefore, the correct answer is Option 3: Ligaments attached to the ciliary body.