Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Our flight was delayed. We decided to spend time at the duty-free shops.
A. As our flight was delayed, we decided to spend time at the duty-free shops.
B. We have been spending time at the duty-free shops since our flight was delayed.
C. We decided to spend time at the duty-free shops in case our flight was delayed.
D. Although our flight was delayed, we decided to spend time at the duty-free shops.