Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions.
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.