Your House Looks the Same to You Whether You Look

Your house looks the same to you whether you look at it at nine in the morning in the full sunlight,or at five in the evening when it is in the shade.The fact that you don't perceive your house as two different colors is due to which of the following?

A) The light reflected from your house is in fact the same color at both times of the day.
B) Your perceptual system recalculates the color based on the change in lighting.
C) The actual change in color is too small for your perceptual system to detect.
D) Opponent processes in the visual cortex regulate your color vision.