Task: Question Answering
Input (English): Problem: on june 1 a bicycle dealer noted that the number of bicycles in stock had decreased by 2 for each of the past 5 months . if the stock continues to decrease at the same rate for the rest of the year , how many fewer bicycles will be in stock on september 1 than were in stock on january 1 ? 
Options: a ) 18 , b ) 12 , c ) 20 , d ) 32 , e ) 36
Output (English): a