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B
Sorting
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C
Scouring
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D
None of the above
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Solution
The correct option is C Scouring Scouring
Wool straight off a sheep, known as "greasy wool" or "wool in the grease", contains a high level of valuable lanolin , as well as the sheep's dead skin and sweat residue, and generally also contains pesticides and vegetable matter from the animal's environment. Before the wool can be used for commercial purposes, it must be scoured, a process of cleaning the greasy wool. Scouring may be as simple as a bath in warm water or as complicated as an industrial process using detergent and alkali in specialized equipment.