If more yellow than blue is mixed, which colour will be formed?

Correct answer: Yellow-green

The governing concept is proportion in subtractive colour mixing. Yellow and blue generally produce green; when yellow is used in the larger proportion, the resulting green shifts toward yellow and is described as yellow-green. Therefore option C is correct. If blue were dominant, the result would lean toward blue-green. Red-violet and red-orange require red, so they cannot be the logical result of mixing only yellow and blue.