💡 Detailed Explanation
The woman is expressing concern for Yamada-san's health, pointing out that they look pale (「顔の色が優れない」) and suggesting they might be overworking (「無理なさってる」). The most appropriate response is to acknowledge the concern while reassuring the speaker. Option 1, 「ご心配には及びませんよ。ちょっと寝不足なだけですから。」 ('There's no need to worry. I'm just a little short on sleep'), politely dismisses the concern and gives a simple reason. This is a common and polite way to respond. Option 2, 「はい、無理してるので休ませてください。」 ('Yes, I'm overworking myself, so please let me rest'), is too direct and demanding. Option 3, 「顔色が悪いのは生まれつきなんです。」 ('I was born with a pale complexion'), ignores the 'recently' (「最近」) part of the question and sounds dismissive.