Task: Question Answering
Input (English): Problem: vanessa , mike and sarah have missed a total of 17 days of school this year . vanessa and mike have missed 14 days total , and mike and sarah have missed 12 days total . how many days of school did vanessa miss alone ? 
Options: a ) 9 , b ) 4 , c ) 5 , d ) 2 , e ) 3
Output (English): c