Which of the following sentences contains a fragment?

A fragment is a part of a sentence that is incomplete and does not express a complete thought. The selected option, "When the storm arrived," is indeed a fragment because it begins with a subordinating conjunction ("when") and lacks an independent clause to provide a complete thought. It leaves the reader expecting more information—what happened when the storm arrived?

The other sentences provided are complete thoughts. They each contain a subject and a predicate, allowing them to stand alone as complete sentences. These complete sentences convey clear actions or decisions without leaving the reader in suspense, distinguishing them from the fragment.