Why Was the Invention of the Cotton Gin Such a Big

Why was the invention of the cotton gin such a big deal?

A) One person operating a cotton gin could clean as much cotton in one day as several workers cleaning by hand could do in a week.
B) One person operating a cotton gin could clean as much cotton in one hour as several workers could clean by hand in a day.
C) The cotton gin could be operated by anyone, while hand-picking required technical skills.
D) The cotton gin was cheaper to build and more durable than its predecessor, the cotton brush.