Question

complete the sentence with the best relative pronoun. the musical ms. stephenson directed was actually quite successful.

Explanation:

To complete the sentence, we analyze the relative clause structure. The antecedent is "the musical" (a thing), and in the relative clause "Ms. Stephenson directed", the relative pronoun acts as the object. For non - human objects, "that" or "which" can be used, and "that" is more common in this context.

Answer:

that (or which)