Question

Either a subordinating conjunction or a relative pronoun may introduce a(n) _____.

independent clause
verbal phrase
prepositional phrase
subordinate clause

Answer 1

Subordinate clause, think of how it's "subordinate" or depending upon the subordinating conjunction or relative pronoun.

Answer 2

Either subordinating conjunction or a relative pronoun may introduce a subordinate clause.

Step-by-step explanation:

A clause which provides additional information in a sentence is said to be a subordinating clause or dependent clause. A subordinating clause does not have an independent stand in the sentence. It either modifies or provides a component in the sentence.