Step 1: Understanding the Concept
The question asks to identify a primary colour from the given list. Primary colours are the foundational colours from which all other colours are derived by mixing.
Step 2: Detailed Explanation
Primary Colours (RYB model): Red, Yellow, Blue.
Secondary Colours: Orange (Red + Yellow), Green (Yellow + Blue), Violet (Blue + Red).
Neutral Colours: White, Black, Gray.
Looking at the options:
(A) Orange is a secondary colour.
(B) White is a neutral colour.
(C) Black is a neutral colour.
(D) Red is a primary colour.
Step 3: Final Answer
Red is a primary colour.