Why will red-orange and blue-green still appear different even if they have equal value?

Correct answer: Their hues and temperatures differ

The governing concept is that colour has several independent properties. Value describes only relative lightness or darkness. Red-orange and blue-green can be adjusted to the same value while retaining different hues, and they usually create different warm–cool impressions. Equal value therefore does not erase hue or temperature. A is correct; B falsely treats one property as all properties, C misclassifies the colours, and D is incorrect because their complementary relationships are not the same.