Your Perception That the White Sheet on Your Bed Appears

Multiple Choice

Your perception that the white sheet on your bed appears to be white in the morning and evening when lighting conditions are dim as well as at noontime when lighting conditions are very bright is due to the fact that:

A) the albedo of the sheet is constant throughout the day
B) the absolute amount of light energy from the sheet that falls on the retina is constant
C) the sheet reflects the same amount of light at all hours
D) we rely on the lightness constancy to determine lightness