💡 Detailed Explanation
The correct choice is Option 2: 'Yes, I don't mind. Go ahead.' The speaker asks for permission: '〜てもいいですか' (Is it okay if I...?). A polite and welcoming way to grant permission is: 'ええ、構いませんよ。どうぞ' (Yes, I don't mind / it's fine. Please). Option 1 ('はい、閉めません' - Yes, I won't close) is contradictory. Option 3 uses the past tense inappropriately.