Task: Question Answering
Input (English): Problem: a box measuring 30 inches long by 48 inches wide by 12 inches deep is to be filled entirely with identical cubes . no space is to be left unfilled . what is the smallest number of cubes that can accomplish this objective ? 
Options: a ) 78 , b ) 80 , c ) 85 , d ) 88 , e ) 90
Output (English): b