Step 1: Socrates' Theory of Virtue.
Socrates' philosophy posits that virtue is knowledge, and genuine knowledge prompts virtuous behavior: - A. Knowledge equals Virtue: Socrates contended that virtue is a form of knowledge, and wrongdoing stems from ignorance of what is genuinely good. - B. Virtue is Singular: Socrates viewed all virtues as fundamentally one, representing a unified form of moral excellence. - C. Knowledge is Power: This idea is attributed to Francis Bacon, not Socrates. - D. Virtue is Unified: This aligns with Socrates' assertion that all virtues are interconnected and form a cohesive whole.
Step 2: Conclusion. The correct selection is 2, encompassing A, B, and D.
Final Answer: \[ \boxed{\text{The correct answer is 2. A, B and D only.}} \]