Identify the fragment in the following sentence: "Although I like to read."

A fragment is a group of words that does not express a complete thought and often lacks a main clause. In the given sentence, "Although I like to read" is a dependent clause that introduces a contrast but does not stand alone as a complete sentence. It leaves the reader expecting more information to complete the thought, making it a fragment.

The other options represent complete thoughts or full phrases. "I like to read" is a complete sentence with a subject and verb, effectively conveying the author's enjoyment of reading. "Like to read" is an incomplete phrase missing a subject, but it isn't introduced as a contrasting thought, unlike the correct choice. "Although I" also presents an incomplete idea, as it leaves the action or subject without context but lacks the clarity of expressing a full thought. Therefore, the correct answer accurately identifies the fragment in this context.