Step 1: Understanding Neutral Colours.
Neutral colours are those that do not have a strong hue and are often used as background colours or to tone down other colours. The primary neutral colours are black, white, and gray. These are often considered to be "neutral" because they are not associated with any specific hue on the colour wheel.
Step 2: Verifying the Options.
- Option (1): There are 3 primary neutral colours: black, white, and gray.
- Option (2): 1 neutral colour is incorrect, as there are more than one.
- Option (4): 2 neutral colours are incorrect.
Conclusion:
Therefore, the correct answer is (3) 3.