If green poster colour is too dark and also too blue, which correction order is more logical?

Correct answer: First balance the hue with yellow, then raise the value with white as needed

The mixture has two separate problems: its hue is too blue and its value is too dark. Adding a small amount of yellow first moves the green toward a more balanced hue; only after that should white be added gradually to increase lightness or value. C follows controlled, one-variable-at-a-time correction. Black worsens darkness, uncontrolled white may obscure the hue, and mixing everything removes precision.