Task: Question Answering
Input (English): Problem: an oil cylinder was 3 / 4 th full . when 4 bottles of oil is poured into it , it is 4 / 5 th full . how many bottles of oil can the full cylinder hold ? 
Options: a ) 90 , b ) 75 , c ) 70 , d ) 80 , e ) 85
Output (English): d