multinational corporation
Let's look at the available options and see what fits best.
multinational organization
* Technically, all companies are organizations, but generally this is reserved for organizations that aren't commercial enterprises. So this is not the correct answer.
foreign firm conglomerate
* This one fails on several fronts, but the most basic is conglomerate which implies multiple lines of business. We're just dealing with a restaurant chain. So this is the wrong answer.
multinational corporation
* This looks good. The company is obviously multinational since it has restaurants in 25 countries. And it is a company. Pretty clearly this is the right choice.
foreign partner
* A foreign partner is an other company that's based in a foreign country. For instance, some manufacturers may get parts from a foreign company to use in their own products. So there's a relationship between the local and foreign companies. But they're not owned and operated by the same overall group. So this is the wrong answer.
