Step 1: Understanding the Question:
• We must arrange the steps used to produce silk filament fibre from the cocoon.
Step 2: Detailed Explanation:
• Stifling (C): the pupa inside the cocoon is killed by heat so that it cannot break the filament.
• Sorting (B): the stifled cocoons are graded by colour, size and quality.
• Reeling (D): the continuous filament is unwound from the cocoons.
• Throwing (E): the reeled filaments are twisted into yarn.
• Degumming (A): the sericin (silk gum) is removed to give lustre and softness.
• Sequence: C, B, D, E, A.
Step 3: Final Answer:
The correct option is (A) C, B, D, E, A.