What is the benefit of preparing an intermediate mixture before making a smooth acrylic gradation?

Correct answer: The colour transition becomes more controlled and even

The governing concept is a stepped colour transition. If two end colours differ greatly, blending them directly can create a sudden band or uneven patch. A pre-mixed intermediate colour reduces that difference, so each neighbouring stage can be blended with less effort and greater control. It does not stop acrylic from drying, harden the brush, or change canvas absorbency. Therefore D is the correct practical benefit.