Task: Question Answering
Input (English): Problem: a box measuring 49 inches long by 42 inches wide by 14 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 ) 82 , c ) 84 , d ) 86 , e ) 88
Output (English): c