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.
4 because it doesn't relate to the other 3 answers
Dunno just need points so I’m giving an answer sorry love!
Answer:
Remember to choose the one you know most about. Then write a sentence backing up your statement.
Explanation: