Which correction is most controlled if a poster-colour skin tone becomes too orange?

Correct answer: Add a tiny amount of blue or a cool neutral

The governing concept is complementary correction through small, measured additions. Orange is strongly influenced by red and yellow, so a tiny amount of blue or a cool neutral can reduce its excessive warmth. The quantity must remain small because too much blue can produce a dull or greenish mixture. More red or yellow increases the orange warmth, while white only raises the value and makes the colour lighter without properly correcting its hue. Therefore, option A gives the most controlled result.