.................... is one of the essential preparatory processes to produce a fabric with smooth finish.

Correct option is A

Singeing is a preparatory process where protruding fibers on the surface of a fabric are burned off to give the material a smooth finish. It enhances the quality of the fabric by improving its appearance and performance during subsequent processing stages.
Information Booster: Singeing is usually performed on woven and knit fabrics to prepare them for dyeing and printing. It prevents pilling and ensures a uniform texture.
Additional Knowledge:
· Bleaching (b): Removes natural or added color impurities, giving the fabric a white base for further processing.
· Tattering (c): Not a recognized textile process.
· Embossing (d): Creates raised patterns on fabric for decorative purposes, not a preparatory process.