English is often seen as an ____________ language in international business.

The chosen answer, "international," is correct because, in the context of the sentence, it serves as an adjective describing the noun "language." This means it characterizes English as a language that is widely used across countries and cultures in the realm of international business, highlighting its global significance and reach.

Using "international" highlights the role of the English language as a common means of communication in various business contexts, which is particularly important since many transactions and negotiations often involve parties from different nations. This usage aligns well with the requirement for descriptive language that clarifies the nature of English in this specific environment.

The other options do not fit grammatically or contextually in the sentence. "Nation" is a noun and does not appropriately modify "language." "Internationally" is an adverb, which does not suit the need for an adjective in this context. "Internationals," while it implies a plural form referring to people, does not fit grammatically or contextually since it would not describe "language" but rather refer to individuals from different countries.