Answer
Aristotle chose Theophrastus to be his successor because he believed that Theophrastus was the most qualified person for the job. Aristotle was impressed by Theophrastus's intelligence, his knowledge of philosophy, and his ability to teach. Theophrastus was also a close friend of Aristotle, and they had worked together for many years. Aristotle knew that Theophrastus would be able to continue his work and keep the Peripatetic school going.