○ 正解です。
For questions using "Do you mind _______?" a "No" answer means "いいよ" and a "Yes" answer means "だめ"
For example :
1. "Do you mind if I use your toilet?"
"No, go ahead." (使っていいよ)
2. "Do you mind if I smoke?"
"I'm sorry but this is a non-smoking house." (ごめんね。吸わないでください。)