Answer:
The correct answer is - texture gradient.
Explanation:
The texture gradient is a depth cue that is a distortion in comparison of size in objects that are farther or closer. In this cue, it looks denser as u move away from the object.
It is dependent on the sense of the depth perception as Wendell can easily tell that trees on the mountain are far from him as he only sees a dense green patch instead of trees individual trees and space in between in them.
Thus, the correct answer is option - texture gradient.