What colour is likely when very little yellow and more white are added to blue?

Correct answer: A light bluish green

The governing concept is colour mixing followed by lightening. A small quantity of yellow added to blue shifts the mixture toward green, but because the yellow is limited, the blue influence remains strong; the result is likely a bluish green. A larger amount of white makes that hue lighter, giving the light bluish-green described in option C. Red and orange require different mixtures, and brown is not the expected result here.