Which colour is likely to form when a little red is added to blue?

Correct answer: Blue-violet

The governing concept is the influence of mixing proportion on an intermediate colour. Since blue is present in the larger amount, adding only a little red shifts blue toward violet without making it fully violet; the expected result is blue-violet, so option C is correct. Yellow-green requires yellow and blue, orange requires yellow and red, and brown is not the usual controlled result of this two-colour mixture.