Final Answer:
The Market supply curve is the horizontal summation of the supply curves for all firms in the market, representing the quantities that producers are willing to supply at various prices. Option B is answer.
Step-by-step explanation:
The market supply curve is derived by horizontally summing the individual supply curves of all firms operating within a specific market. Each firm has its own supply curve showing the quantity it is willing to supply at different prices. When these individual supply curves are aggregated, the market supply curve is formed, depicting the total quantity that all producers in the market are collectively willing to supply at each price level. Option (b) Market supply curve accurately captures this concept, distinguishing it from the firm's supply curve, which represents the quantity supplied by an individual firm.
Option B (Market supply curve) is the answer.