What is generally formed by adding white to a colour?

Correct answer: Tint

Adding white to a colour produces a lighter version called a tint, so option C is correct. For example, adding white to red produces a lighter red commonly described as pink. A shade is made by adding black, while a tone is commonly made by adding grey or a neutral colour. A complementary colour is determined by a colour-wheel relationship, not by adding white to the original colour.