💡 Detailed Explanation
The correct choice is '丁寧' (teinei - polite/courteous/diligent). Sentence translation: 'The shop staff always answers my questions politely.' '丁寧' accurately describes a detailed and respectful response. '静か' (shizuka - quiet), '簡単' (kantan - simple/easy), and '元気' (genki - energetic) do not fit the context of a customer service response as well as '丁寧'.