Correct Answer: Monopoly

Solution : The correct choice is the third option .

The most appropriate word for the expression "exclusive command or possession" is m onopoly.

The meanings of the other options are as follows:

• Sanctum: It refers to a sacred or private place.
• Hypergamy: This term relates to the practice of marrying into a higher social group.
• Parvenu: This term describes a person who has recently gained wealth or social status but lacks the appropriate social skills or manners.

Therefore, the correct answer is monopoly.