Which statement explains why a blue house looks blue?

the house reflects mostly red and green light
the house absorbs mostly blue light
the house reflects mostly blue light
the house reflects every color expect blue

The house reflects mostly blue light.

Explanation: The color of an object as seen by our eyes is determined by the color of the light that they reflect.

In case of a blue painted house, all the other colors of white light ( which is a combination of multiple colors) falling on the house are absorbed and only the blue colored light gets reflected back. Hence the house appears to be blue to our eyes.