Step 1: Understanding Warm Colours.
Warm colours are those that evoke warmth and energy. These include red, orange, and yellow. Red is the most typical warm colour.
Step 2: Verifying the Options.
- Option (1): Sky blue is a cool colour.
- Option (2): Red is a classic warm colour.
- Option (3): Blue is a cool colour.
- Option (4): Paddy green is a cool colour, not a warm colour.
Conclusion:
Therefore, the correct answer is (2) Red.