Final answer:
Socrates would most likely respond to someone who made the statement 'That is a horse' by asking 'What do you mean by 'horse'?'.
Step-by-step explanation:
Socrates would MOST likely respond to someone who made the statement “That is a horse” by asking, What do you mean by 'horse'? Socrates was known for his philosophical questioning and his Socratic method of inquiry. He often sought to clarify the definitions and meanings of terms and concepts in order to stimulate critical thinking and deeper understanding.