What is the most systematic method for preparing several oranges for a sunset?

Correct answer: Make a sample strip using different red-yellow ratios

The governing concept is controlled colour mixing. Orange is a secondary colour produced from red and yellow. A sample strip with measured or deliberately varied red-yellow proportions provides an ordered range, such as yellow-orange through red-orange, so the painter can compare and select colours for different sunset areas. Option A is therefore correct. Blue tends to dull orange, while black and white mainly alter value rather than systematically changing its hue.