Invented to make taking seeds from cotton easier.

• A. Seed drill
• B. Spinning wheel
• C. Cotton gin
• D. Reaper

Answer: (C)

The main idea is understanding an invention that speeds up a specific farming task. The cotton gin was designed to separate seeds from cotton fibers quickly, turning a slow, labor-intensive job into a fast one. Because this device cleaned much more cotton, farmers could process larger amounts, helping cotton become a major crop in the South and shaping the region’s economy and labor needs. The other inventions do different jobs—seed drills plant seeds, spinning wheels make yarn, and reapers harvest grain—so they don’t fit the purpose of making the seed-removal task easier.