If red-orange and blue-green of equal value and saturation are placed together, which colour generally appears more advancing?

Correct answer: Red-orange

The governing concept is colour temperature and apparent spatial advance. Red-orange is a warm colour, while blue-green is generally cool. When value and saturation are held equal, warm hues tend to appear visually nearer or advancing, whereas cool hues tend to recede. Therefore option A is correct. Option B reverses the usual temperature effect, C ignores the contrast between warm and cool, and D introduces a colour not present in the comparison.