Step 1: Understanding the Concept
The question asks to identify a secondary colour from the list. Secondary colours are created by mixing two primary colours.
Step 2: Detailed Explanation
Using the traditional RYB (Red, Yellow, Blue) primary colour model:
Red + Yellow = Orange
Yellow + Blue = Green
Blue + Red = Violet
Let's analyze the options:
(A) Black is a neutral colour.
(B) Blue is a primary colour.
(C) Red is a primary colour.
(D) Orange is a secondary colour.
Step 3: Final Answer
Orange is the secondary colour among the choices.