Firm 1 will not produce anything if the market price is less than p1 while firm 2 will not produce anything if the market price is less than p2. For a market price greater than or equal to p1 but strictly less than p2, the market supply curve (Assume also that p2 is greater than p1)

is the difference of supply curve of firm 1 and firm 2 coincides with the supply curve of firm 2 coincides with the supply curve of firm 1 none of above

coincides with the supply curve of firm 1

For a market price greater than or equal to p1 but strictly less than p2 , only firm 1 will produce a positive amount of the good. Therefore, in this range, the market supply curve coincides with the supply curve of firm 1.