Which colour is usually formed by mixing red and yellow?

Correct answer: Orange

In the traditional paint colour system, red and yellow are both primary colours. When these two are mixed, they produce orange, a secondary colour; therefore, option B is correct. Green is made from yellow and blue, while violet is made from red and blue. Blue itself is one of the primary colours, not the usual result of mixing red and yellow. This pair-based rule confirms the answer.