Step 1: Understanding Aristotle's Works.
Aristotle was a Greek philosopher who wrote extensively on various subjects. Among his works are the Politics, Metaphysics, and Organon. However, the Apology is not one of Aristotle’s works; it is written by Plato and recounts the trial of Socrates.
Step 2: Analyzing the Options.
- 1. Politics: This is a work by Aristotle on political theory and governance.
- 2. Metaphysics: This is another work by Aristotle that deals with the fundamental nature of reality.
- 3. Organon: This is a collection of works by Aristotle related to logic.
- 4. Apology: This is incorrect. The Apology is written by Plato, not Aristotle.
Step 3: Conclusion.
The correct answer is 4. Apology.
Final Answer:
\[
\boxed{\text{The correct answer is 4. Apology.}}
\]