Task: Question Answering
Input (English): Problem: company c sells a line of 20 products with an average retail price of $ 1,200. if none of these products sells for less than $ 400, and exactly 10 of the products sell for less than $ 1,000, what is the greatest possible selling price of the most expensive product ?
Options: a. 12000, b. 11000, c. 10000, d. 13000, e. 15000
Output (English): b