A student says red and blue make green. What is the correct correction?

Correct answer: Red and blue make violet

According to the traditional paint colour wheel, red and blue are primary colours. Mixing them produces violet, also called purple, so option B gives the correct correction. Green is made by mixing yellow and blue, whereas orange is made by mixing red and yellow. The result can vary slightly with pigments, but the standard school-art relationship tested here is red plus blue equals violet.