Task: Question Answering
Input (English): Problem: of the people who responded to a market survey , 200 preferred brand x and the rest preferred brand y . if the respondents indicated a preference for brand x over brand y by ratio of 4 to 1 , how many people responded to the survey ? 
Options: a ) 80 , b ) 160 , c ) 250 , d ) 350 , e ) 480
Output (English): c