How does the result change if blue is added to yellow instead of red?

Correct answer: Green will form

In the traditional subtractive art colour model, yellow mixed with blue produces green, so option C is correct. Yellow mixed with red produces orange, which is the mixture mentioned for comparison. Violet is produced by combining red and blue, and adding blue to yellow does not create pure red. The exact hue can vary with pigment, but green is the expected school-level answer.