From the Window of an Office on a Skyscraper's 90th

Multiple Choice

From the window of an office on a skyscraper's 90th floor,taxis on the street look tiny.Of course,you know they are not toy cars; you are just really far up.This example illustrates the _____ cue of _____.

A) monocular; relative size
B) binocular; relative size
C) monocular; texture gradient
D) binocular; texture gradient