Task: Question Answering
Input (English): Problem: a garrison of 2000 men has provisions for 40 days . at the end of 20 days , a reinforcement arrives , and it is now found that the provisions will last only for 10 days more . what is the reinforcement ? 
Options: a ) 1888 , b ) 2766 , c ) 2999 , d ) 2000 , e ) 1712
Output (English): d