The underlined part of the sentence, "who we watched every morning on TV," is a relative clause.
A relative clause is a clause that modifies a noun or pronoun and is introduced by a relative pronoun (such as "who," "whom," "whose," "that," or "which"). In this case, the relative clause "who we watched every morning on TV" modifies the noun "Mr. Rogers" and is introduced by the relative pronoun "who."
A noun phrase is a group of words that functions as a noun in a sentence. In this case, the noun phrase is "Mr. Rogers," which is the subject of the sentence.
An independent clause is a clause that can stand on its own as a complete sentence. In this case, the independent clause is the entire sentence, "Mr. Rogers, who we watched every morning on TV, studied Childhood Education."
A dependent clause is a clause that cannot stand on its own as a complete sentence and must be attached to an independent clause in order to form a complete sentence. In this case, the relative clause "who we watched every morning on TV" is a dependent clause because it cannot stand on its own as a complete sentence.
Based on this information, the correct answer is "relative clause."