Task: Question Answering
Input (English): Problem: sand is poured into a box so that the box is being filled at the rate of 4 cubic feet per hour. if the empty rectangular box is 7 feet long, 6 feet wide, and 2 feet deep, approximately how many hours does it take to fill the box ?
Options: ['a. 20', 'b. 21', 'c. 22', 'd. 23', 'e. 24']
Output (English): b