Answer:
The method of business integration that would be classified as an ADR is C: "Multinational."
Step-by-step explanation:
ADR (American Depository Receipts) is a financial instrument that represents shares in a foreign-based company that trades on a U.S. stock exchange. A multinational corporation is a company that has operations in multiple countries and can be classified as an ADR because it is based in a foreign country but listed on a U.S. stock exchange. Conglomerate, vertical, and horizontal integrations are different methods of business consolidation that do not necessarily involve a foreign-based company trading on a U.S. stock exchange.