We got lost because we forgot to take a map with  us.

A. Unless we had forgotten to take the map with us, we would have got  lost.

B. If we had remembered to take a map with us, we wouldn't have got  lost.

C. Had we not forgotten to take the map with us, we would have got  lost.

D. If we had remembered to take a map with us, we would have got  lost.