How will green change when the amount of yellow is increased?

Correct answer: Yellow-green

The governing concept is colour bias caused by changing the mixing ratio. Green contains yellow and blue; when additional yellow is added, yellow becomes more dominant, so the green shifts toward yellow-green. Therefore, option D is correct. Adding more blue would move the mixture toward blue-green, while violet and red-orange require different colour combinations. The exact strength of the yellow-green depends on how much yellow is added.