Final answer:
Cave art most helps answer the question of what did people look like in the past, providing insights into their physical appearance, clothing, hairstyles, and more.
Step-by-step explanation:
The question that cave art most helps to answer is B) What did people look like? Cave art often depicts human figures, providing us with valuable insights into the physical appearance of the people of the past. By studying these depictions, we can learn about their clothing, hairstyles, body adornments, and even the different roles and activities of different individuals within the society.