How can a light peach-like acrylic colour be made?

Correct answer: By mixing white into orange

The governing concept is tinting: adding white to a hue increases its lightness while retaining the hue family. Orange lightened with white produces a soft peach-like colour, so option B is correct. Blue plus white creates a pale blue, green plus black creates a dark green, and yellow mixed with violet tends toward a dull neutral or brownish colour because they are complementary colours. Add white gradually for control.