Final answer:
Socrates argued that moral truth is based on reason and serious questioning, which is true. He used the Socratic method to guide others in arriving at real, stable truths about morality and ethics.
Step-by-step explanation:
Socrates argued that moral truth is based on reason and serious questioning. This claim is true. Socrates believed that people should seek the answers to life's questions through reason and critical thinking. He maintained that ideas should be subjected to criticism and should be stated clearly and precisely. Socrates used the Socratic method, a question-and-answer technique, to guide others in arriving at real, stable truths about morality and ethics.