Which of the following statements regarding depth perception is true?
a. motion parallax is detected because we perceive binocular disparity.
b. experience teaches us to perceive relative size as an indicator of the color of an object.
c. texture gradient is a monocular cue.
d. the change in position of an object relative to the retina is a binocular cue.

The answer is (A). Motion parallax is detected because we perceive binocular disparity.

Explanation:

Motion parallax: The term parallax refers to a  position change.Motion parallax is a monocular depth cue coming  from the velocities of relative objects passing  across  a moving person's retinae.

Therefore, the  motion parallax is a position change that is  caused by the movement of the viewer or person.

c) vampires in history and modern life.