How Could Conditions of Imperfect Competition Explain Deviations from PPP

Multiple Choice

How could conditions of imperfect competition explain deviations from PPP?

A) Imperfect competition means that prices are higher than costs and may not converge.
B) Governments often restrict trade in those goods.
C) Goods sold under conditions of imperfect competition are often inferior.
D) Arbitrageurs do not recognize profit opportunities in these markets.