Task: Question Answering
Input (English): Problem: jill has 21 gallons of water stored in quart , half - gallon , and one gallon jars . she has equal numbers of each size jar holding the liquid . what is the total number of water filled jars ? 
Options: a ) 3 , b ) 6 , c ) 9 , d ) 36 , e ) 14
Output (English): d