Read the sentence.
the student whom mr. stein chose was first in her class.
the bolded words are what kind of clause?
adverb clause
adjective clause
noun clause

I think the bolded words would be "whom Mr. Stein chose". The clause whom Mr. Stein chose is an example of an adjective because the clause describes the word student. Student is the subject of the sentence and is a noun. An adjective describes a noun or another subject. an adverb describes a verb or another adverb.