Step 1: Understanding Brush Sizes.
Brush sizes are numbered based on the thickness of the brush. The higher the number, the thicker the brush. Therefore, a No. 6 brush is the thickest among the options.
Step 2: Verifying the Options.
- Option (1): No. 6 is the thickest brush, making this the correct answer.
- Option (2): No. 1 is a fine brush, not thick.
- Option (3): No. 2 is medium
-sized but not as thick as No. 6.
- Option (4): No. 4 is also not the thickest.
Conclusion:
Therefore, the correct answer is (1) No. 6.