Size constancy refers to perceiving objects as __________.

A) the same size, even if they are really different sizes
B) different in size, even though they are really the same size
C) the same size, even when they move closer or further away
D) the same size, even when they become physically smaller, as when a balloon loses air

Size constancy refers to the ability to perceive an object as the same size, regardless of its distance from us. Even if the object appears larger or smaller due to its distance, we still perceive it as being the same size. However, this does not apply when the object physically changes in size, such as a balloon losing air, as mentioned in option D. Option A is incorrect because if objects are different sizes, they will be perceived as such. Option B is also incorrect because if objects are the same size, they will be perceived as such.