The sentence "She smiled as she opened the package." includes a dependent clause.
The sentence that includes a dependent clause is: "She smiled as she opened the package." To determine this, we need to understand what a dependent clause is. A dependent clause is a group of words that contains a subject and a verb but cannot stand alone as a complete sentence. In this case, "as she opened the package" is the dependent clause because it cannot stand alone as a complete sentence. Therefore, the correct answer is "She smiled as she opened the package."
