💡 Detailed Explanation
The man is apologizing formally, taking the blame for a project's failure. The most appropriate response from a superior is to reassure him and mitigate his sense of responsibility. Option 1 does this by saying 'it's not your fault alone' and 'don't worry about it.' Option 2 ('I'm also extremely disappointed') focuses on the boss's own feelings and doesn't properly console the subordinate. Option 3 ('That's right. We should have proceeded more carefully') effectively agrees with the man's self-blame, which is harsh and not a typical supportive response.