Which colour pair is correct for making yellow-green?

Correct answer: Yellow and green

Yellow-green is made by mixing yellow, a primary colour, with green, a neighbouring secondary colour on the traditional colour wheel. Thus option C is correct. The names of many tertiary colours help identify their component pair: blue and green produce blue-green, red and orange produce red-orange, and red with violet produces red-violet. Therefore, option A is not correct because it makes blue-green, not yellow-green.