Firms in Perfect Competition Determine Their Profit- Maximising Level of Output

Firms in perfect competition determine their profit- maximising level of output by:

A) accepting the market determined price and finding the corresponding profit- maximising quantity where MR =MC
B) accepting the market determined quantity and finding the corresponding profit- maximising price where MR =MC
C) accepting the market determined price and quantity
D) finding the profit- maximising price and quantity where total revenue and total cost are equal