In free-enterprise systems around the world, there are

no restrictions on business ownership or business activity.
some restrictions on business activity but not on business ownership.
some restrictions on business ownership but not on business activity.
some restrictions on business ownership and business activity.

The answer is the last one. Some restrictions on business ownership and business activity.

Explanation:

Although the term is "free enterprise system", this does not imply that everything is free and business owners and business activities are not regulated and they are free to do whatever they want.

Often there are national laws and regulations, International rules and regulations, and even ethical frameworks that Business owners and business activities must follow.

In every nations that implements a free enterprise system, we can see some restrictions on ownership and some restrictions on business activities.

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