💡 Detailed Explanation
The man is praising the listener for completing a difficult project. The phrase 「一筋縄ではいかない」 means 'not easy' or 'not straightforward'. 「よくぞものにしたね」 is high praise for achieving something difficult. The most appropriate response in a business context is to humbly accept the praise and attribute the success to the support of others. Option 1, 「いえ、これも皆様のご支援の賜物です。」 ('No, this is all thanks to everyone's support'), does this perfectly. Option 2, 「ええ、思ったより楽でした。」 ('Yes, it was easier than I thought'), sounds arrogant. Option 3, 「すみません、次はもっとうまくやります。」 ('I'm sorry, I'll do better next time'), is an unnecessary apology and sounds like they are admitting their work was not good enough, which is inappropriate when receiving praise.