Identify the complete sentence from the following options.

• A. Looking forward to July?
• B. On Central Avenue, near the library.
• C. Pay the bill.
• D. The three most important tools.

Answer: (C)

The choice "Pay the bill." is a complete sentence because it contains a subject and a predicate, which is essential for a sentence to be considered complete. In this instance, although the subject "you" is implied, the command is clear: it instructs someone to take action regarding the bill.

The other options do not form complete sentences. "Looking forward to July?" is a fragment and lacks a clear subject and verb; it leaves the reader without understanding who is looking forward or what specifically is desired. "On Central Avenue, near the library." is also a fragment as it serves only as a prepositional phrase and does not provide a complete thought. "The three most important tools." similarly is a fragment as it describes a noun but does not convey a complete idea or action.

Thus, "Pay the bill." stands out as the only choice that fulfills the requirement of a complete sentence.