Which mixture can be used to create blue-green?

Correct answer: More blue in green

The governing concept is intermediate-colour formation through hue proportion. Green mixed with a greater amount of blue shifts toward the blue side of the colour wheel, producing blue-green; therefore option D is correct. Red added to yellow tends toward orange, and white added to violet makes a lighter tint rather than blue-green. Blue mixed with orange combines complementary hues and generally becomes dull or neutral instead of producing a clean blue-green.