Which correctly states the difference between a tint and a shade?

Correct answer: White is added to a colour to make a tint, whereas black is added to make a shade

The governing concept is value modification. A tint is a lighter version of a hue made by adding white, whereas a shade is a darker version made by adding black. This makes option A correct. Option B reverses the definitions. A complementary colour may neutralise or dull a hue rather than define a tint or shade, and mixing primary colours describes colour creation, not the specific lightness change used for these terms.