What is a simple practical way to remember secondary colours?

Correct answer: Mix the primary colours yourself

The most useful practical way to remember secondary colours is to mix the primary colours and observe the results: red plus yellow makes orange, yellow plus blue makes green, and blue plus red makes violet. This hands-on process connects each colour with its source pair, so option A is correct. Alphabetical writing may support recall, but counting brushes or folding paper does not teach the colour relationships.