I thought I should ask the doctor about going on a diet. I went to the surgery

I thought I should ask the doctor about going on a diet. I went to the surgery
A. Having been on a diet, I went to the surgery.
B. I went to the surgery, so I asked the doctor about going on a diet.
C. I asked the doctor about going on a diet, so I went to the surgery.
D. I went to the surgery in order to ask about going on a diet.

Đáp án: D
Dịch: Tôi đã đi phẫu thuật để hỏi về việc ăn kiêng.