Final answer:
Hume's skeptical argument questions our knowledge about causal relationships in the world, arguing that we cannot have certainty beyond our sense impressions. He rejects the notion that we can have certain knowledge about causal relationships.
Step-by-step explanation:
Hume's skeptical argument concerning our knowledge about causal relationships in the world is based on his skepticism towards our ability to have true knowledge. According to Hume, all our knowledge comes from our senses and impressions, and we cannot have certainty about anything beyond our sense impressions. This skepticism extends to our knowledge about causal relationships. Hume argues that we cannot prove causation, as it relies on assumptions and generalizations from our past experiences. Therefore, Hume rejects the notion that we can have certain knowledge about causal relationships in the world.