Given the supply data: Supplier M supplies 4 units at \$2, 9 units at \$5; Supplier N supplies 6 units at \$2, 11 units at \$5. What is the market supply at \$5, and how would you graph it?

• A. The market supply at \$5 is 20 units, and it is graphed by summing the individual supply curves of Suppliers M and N.
• B. The market supply at \$5 is 15 units, and it is graphed by averaging the individual supply curves of Suppliers M and N.
• C. The market supply at \$5 is 11 units, and it is graphed by using only Supplier M's supply curve.
• D. The market supply at \$5 is 18 units, and it is graphed by subtracting Supplier N's supply from Supplier M's supply.

Answer: (A)