In manufacturing and selling a dermatological cream that depends crucially on copper peptide, a molecule that combines copper and several amino acids, you earn positive economic profits. Chile, the world's leading producer of copper, is experiencing long-term labor strife in the copper mining industry, constraining the supply of copper peptide and raising your variable costs. Rationally, you should:

a. either exit or remain in the market, depending on how much your variable costs rise.

b. continue to produce at the same level.

c. exit the market.

d. increase output.