Task: Question Answering
Input (English): Problem: in an examination , a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer . if he attempts all 80 questions and secures 120 marks , the number of questions he attempts correctly , is : 
Options: a ) 35 , b ) 46 , c ) 42 , d ) 30 , e ) 40
Output (English): e