And Two types of monocular depth cues are
A. motion parallax ... pictorial depth cues
B. convergence... retinal disparity
C. motion parallax . . . retinal disparity
D. convergence... pictorial depth cues

A

Explanation:

motion parallax and pictorial depth cues

that would be because of both gravity and friction. so     c

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.