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.