Task: Question Answering
Input (English): Problem: a factory producing tennis balls stores them in either big boxes , 25 balls per box , or small boxes , 20 balls per box . if 76 freshly manufactured balls are to be stored , what is the least number of balls that can be left unboxed ? 
Options: a ) 2 , b ) 1 , c ) 4 , d ) 6 , e ) 8
Output (English): b