Correct Answer: Capitalist

Solution : The correct choice is the third option.

Explanation : The term capitalist functions as a noun and specifically denotes an individual who possesses wealth, particularly with investments in businesses. The grammatical structure aligns with the context of describing a person with financial resources engaged in business activities.

The meanings of the other options are as follows:

• Industrialist : This term refers to a person involved in the ownership and management of industry, typically manufacturing.
• Minimalist: This term refers to a person who seeks simplicity and minimalism in various aspects of life
• Leftist: This term refers to a person with left-wing political views

Therefore, the correct one-word substitute is capitalist .