Task: Question Answering
Input (English): Problem: in an examination , a student scores 3 marks for every correct answer and loses 1 mark for every wrong answer . if he attempts all 120 questions and secures 180 marks , the number of questions he attempts correctly , is : 
Options: a ) 45 , b ) 90 , c ) 80 , d ) 75 , e ) 70
Output (English): d