Passage Summary: We now have green and brown cotton that machines can process, which is great because it saves money and prevents pollution by skipping the dyeing process entirely.

Reasoning: Naturally colored cotton became commercially viable only after a machine-spinnable variety was developed, allowing producers to bypass the costs and environmental risks of synthetic dyeing.

Analysis: In a 'Must be True' scenario, we treat every statement in the stimulus as an absolute fact and look for a deduction that is logically unavoidable. The text explicitly links commercial feasibility to the ability to spin the fibers by machine, implying that manual processing was likely too expensive or slow for the market. We can also infer that the environmental benefits are a direct consequence of the cotton's natural color. Look for an answer choice that stays within these bounds without introducing outside information about consumer demand or other types of fabric.