View the Exhibit and examine the structure of the ORDERS table. Which task would require subqueries？  （）

• A、 displaying the total order value for sales representatives 161 and 163
• B、 displaying the order total for sales representative 161 in the year 1999
• C、 displaying the number of orders that have order mode online and order date in 1999
• D、 displaying the number of orders whose order total is more than the average order total for all online orders