💡 Detailed Explanation
The man is using the idiom '一筋縄ではいかない' (hitosujinawa de wa ikanai), meaning 'not straightforward' or 'not easy to deal with.' He is expressing that the job is far more difficult than he had anticipated. The most natural response is to agree with this sentiment. Option 1 ('Yes, it has far exceeded our expectations, hasn't it?') correctly understands the idiom and agrees with the speaker. Option 2 ('No, if we have one rope, we can manage') takes the idiom '一筋縄' (single rope) literally, which is incorrect. Option 3 ('That's right, let's finish the jobs one by one') misses the nuance of the speaker's frustration about the overall difficulty.