Task: Question Answering
Input (English): Problem: in an examination , a student scores 3 marks for every correct answer and loses 2 marks for every wrong answer . if he attempts all 100 questions and secures 300 marks , the number of questions he attempts correctly , is : 
Options: a ) 150 , b ) 250 , c ) 400 , d ) 300 , e ) 100
Output (English): e