Which secondary colour is formed by mixing red and yellow?

Correct answer: Orange

The governing concept is traditional subtractive colour mixing in art. Red and yellow are both primary colours, and combining them produces the secondary colour orange; therefore option C is correct. Green results from yellow plus blue, violet results from red plus blue, and blue itself is a primary colour. Remember the three common pairs: red + yellow = orange, yellow + blue = green, and red + blue = violet.