- Step 1: House 1 = Red, House 3 = Cat.
- Step 2: Colors available: Blue, Green, Yellow for Houses 2, 3, 4.
- Step 3: House 3 cannot be Red (House 1).
- Step 4: Assign Blue, Green, or Yellow to House 3. Assume Blue for consistency.
- Step 5: Verify: No conflict with other constraints.
- Step 6: Option (2) is correct (assuming specific assignment).