Answer:
D. All of the above.
Step-by-step explanation:
A perfect market are describe where the buyers can buy any quantity without effecting the price of the product and sellers can sell the any quantity of goods without effecting the price because the market is competitive so a little change in the price can effect the quantity of that product. In perfect market Quantity may vary but price may not. The parties in the market are price taker. Parties means the suppliers/ firms /producers.