Answer:
c. because P > MC, a basic condition for efficiency is violated.
Step-by-step explanation:
An unregulated monopoly is a market in which monopoly holders have control over goods and services, giving them the ability to do whatever they like. Under unregulated monopoly, having a free market is impossible as price gouging is always evident.
In unregulated monopoly a basic condition for efficiency is violated because price is greater than marginal cost (P > MC).
Where P is the price and MC is the marginal cost of goods.