only the clues The WTO<span> came into being in 1995, succeeding the General Agreement on Tariffs and Trade (GATT) that was established in 1947. First of all, the </span>IMF<span> makes loans to "developing" countries to help them build infrastructure. ... In short, we can say that </span>the IMF <span>and the </span>WTO play<span> a huge </span>role<span> in </span><span>globalization
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Since nothing is underlined, I am going to make an educated guess that the underlines clause is "who had worked with the business person". If that is the case, the correct answer would be D - adjective clause. It is a relative clause, to be more precise, because it starts with a relative pronoun "who", but that is a part of adjectival clauses, so that is the correct answer.