Passage Summary: Since we can't use our eyes or senses to prove math is true, we can't actually know if any of it is true.

Conclusion: It is impossible to have knowledge of any mathematical proposition.

Reasoning: No mathematical proposition can be proven to be true through the use of observation.

Analysis: The argument suffers from a significant gap between the method of proof and the possibility of knowledge. It assumes that observation is the only valid pathway to knowing a mathematical truth. To bridge this gap for a Sufficient Assumption question, look for an answer that establishes a conditional rule: if something cannot be proven by observation, it cannot be known. This would effectively lock the premise to the conclusion by making observation a mandatory requirement for knowledge.