Passage Summary: In medieval Spain, most gold coins were made from naturally high-quality gold from Senegal. While the mints were capable of refining gold to make even purer coins, they left the Senegalese gold exactly as it was found.

Reasoning: Most gold coins in medieval Spain were made from Senegalese gold, which was naturally 92 percent pure and never refined, while other coins were made from refined gold and reached higher purity levels.

Analysis: Since this is a Most Strongly Supported question, we must treat the premises as absolute facts and look for a logical deduction. We are told that Senegalese gold was 92 percent pure and was never refined, yet the mints produced 'other kinds of coins' that were 'much purer.' This creates a clear distinction between the common Senegalese coins and these rarer, highly refined coins. Look for an answer that acknowledges that some gold coins in circulation in medieval Spain actually had a higher gold content than the 92 percent found in the Senegalese coins.