The processes involved in jute production are:
Harvesting → Retting → Peeling → Washing → Drying → Spinning → Knitting/Weaving
Retting is a process in which the stems of the harvested jute plants are immersed in water for 10-15 days due to which they rot. It helps to extract the jute fibres easily.
The processes involved in wool production are:
Rearing and breeding → Shearing → Scouring → Sorting → Cleaning burr → Carding → Combing → Dyeing → Spinning → Knitting/Weaving
Shearing is the process of removing the fleece from the wool-yielding animals.
The processes involved in silk production are:
Boiling → Reeling → Scouring → Spinning → Knitting/Weaving
Reeling is the process of extracting silk fibres from the cocoons of silkworms.
The processes involved in cotton production are:
Harvesting → Ginning → Carding → Combing → Dyeing → Spinning → Knitting/Weaving
Ginning is the process of separating seeds from cotton fibre.
Nylon is a synthetic fibre synthesised using chemicals. Therefore the process of ginning is not involved in its production or extraction.
Hence, option D is the correct answer.