Task: Question Answering
Input (English): Problem: a garrison of 2000 men has provisions for 54 days . at the end of 15 days , a reinforcement arrives , and it is now found that the provisions will last only for 20 days more . what is the reinforcement ? 
Options: a ) 1778 , b ) 1682 , c ) 9178 , d ) 1900 , e ) 1782
Output (English): d