What colour is generally formed by mixing red and blue?

Correct answer: Violet

Under the traditional art colour wheel, red and blue are primary colours whose mixture forms violet, so option B is correct. This is a secondary-colour relationship: yellow mixed with blue produces green, while red mixed with yellow produces orange. Yellow is not formed by this pair, and orange requires red plus yellow rather than red plus blue. The result may vary slightly in shade with different pigments, but violet is the standard school answer.