Final answer:
The true statement about Parent Companies is that they and their related chains have changed over time, reflecting the dynamic nature of corporate structures and market conditions.
Step-by-step explanation:
The correct statement about Parent Companies is: a. Parent Companies and the related chains have changed over time. A parent company is a business that owns enough voting stock in another company to control management and operations. The ownership of these subsidiaries can be through a range of more than five chains and these chains can span across a variety of scales. Also, parent companies are not limited to owning businesses in a single industry or a single country; they can have a global presence with a diverse portfolio.