Task: Question Answering
Input (English): Problem: the average of 10 numbers was calculated as 17 . it is discovered later on that while calculating the average , one number , namely 56 , was incorrectly read as 26 . what is the correct average ? 
Options: a ) 19 , b ) 20 , c ) 21 , d ) 22 , e ) 23
Output (English): b