The correct response is:
Red stripes reflect red and absorb all other light, as does the blue square with blue; white stripes and stars reflect all wavelengths; and the flagpole absorbs all wavelengths.
This statement correctly explains how the colors of the flag are perceived: the red and blue parts reflect their respective colors while absorbing the others, the white parts reflect all wavelengths (resulting in their brightness), and the black flagpole absorbs most wavelengths, appearing black to the eye.