Step 1: Understanding the Concept:
Sewing machine needle sizing standards determine needle shank thickness and blade strength for different fabric weights.
Step 2: Detailed Explanation:
Sewing machine needle size selection guidelines (Singer European metric system):
- Size 9--11 (65--75): Delicate, sheer, lightweight fabrics (chiffon, silk, voile).
- Size 14 (90): Medium weight fabrics (cotton, linen, shirtings).
- Size 16 (100): Medium-heavy fabrics (denim, suiting, light canvas).
- Size 18 (110): Heavy, thick fabrics (heavy furnishing fabrics, upholstery, thick canvas, heavy curtains).
Step 3: Final Answer:
Therefore, needle size 18 is used for thick furnishing fabrics, corresponding to option (D).