Answer:
D
Explanation:
These are the definitions of each:
A.a general increase in prices and fall in the purchasing value of money.
B. a company or group of people authorized to act as a single entity (legally a person) and recognized as such in law.
C. a tax or duty to be paid on a particular class of imports or exports.
D. the exclusive possession or control of the supply or trade in a commodity or service.
Monopoly seems the most fitting.