What is the correct tertiary sequence from blue toward red?

Correct answer: Blue → blue-violet → violet → red-violet → red

The governing concept is the order of neighbouring hues on a colour wheel. Moving from blue toward red through the violet side gives blue-violet, violet, and red-violet, followed by red. These intermediate hues are formed between adjacent colours, so option A gives the continuous sequence. Option B travels toward green and yellow, while option C skips red-violet; option D lists broad colour changes rather than the correct tertiary path.