Which colour is generally formed by mixing blue and yellow?

Correct answer: Green

Under the traditional subtractive paint model, blue and yellow are primary colours and their mixture generally produces green. Thus, option D is correct. Orange is made from red and yellow, and purple or violet is made from red and blue. A muddy brown may appear with impure or uneven pigments, but it is not the standard expected result of this school-level colour-mixing question.