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 60 questions and secures 150 marks , the no of questions he attempts correctly is : 
Options: a ) 35 , b ) 38 , c ) 40 , d ) 42 , e ) 44
Output (English): d