Which Problem with Cotton Did Eli Whitney Solve by Inventing

Which problem with cotton did Eli Whitney solve by inventing the cotton gin?

A) Whitney figured out how to remove the cotton-destroying boll weevil and thereby save the cotton crop.
B) Removing seeds from the cotton was a slow and painstaking task, but Whitney made it much easier and less labor-intensive.
C) Processing cotton required too many different pieces of equipment, but Whitney figured out how to change the equipment more easily and quickly, saving time and money.
D) Planting the cotton took too many hours to make its growth very profitable, but Whitney enabled planters to use a machine to speed the planting.
E) The production of southern whiskey required the use of cotton in purifying the liquor, but the cotton absorbed too much liquid; Whitney's machine changed that.