Read the excerpt below and answer the question.

"I think I should give the reason for my being in Birmingham, since you have been influenced by the argument of "outsiders coming in."

The underlined portion (since you have been influenced by the argument of "outsiders coming in") of this excerpt from King's "Letter from a Birmingham Jail" is an example of a(n) _____.

SELECT ALL THAT APPLY

adverbial clause
dependent clause
independent clause
noun clause