Which form is created by adding black to a cool colour?

Correct answer: Shade

The governing concept is the modification of colour value. Adding black lowers the lightness of a colour and produces a darker version called a shade. Thus, black added to a cool colour such as blue, green, or violet creates a cool shade. A tint is made by adding white, and a tone is commonly made by adding grey. A complementary colour depends on the colour wheel, not black, so option B is correct.