Assertion: Ashoka pillars, crafted from polished sandstone, are renowned for their unique Mauryan polish, which has maintained its gloss for over two millennia. This assertion is accurate. Reason: Ashoka pillars are situated across the Indian subcontinent (e.g., Sarnath, Vaishali, Delhi-Topra, Lauriya Nandangarh), many locations experiencing monsoon conditions. The polish's preservation stems from advanced Mauryan polishing techniques and material quality, not solely from a lack of moisture. Therefore, the reason is inaccurate for numerous locations. Since the assertion is true and the reason is false, this corresponds to option (3).