Choose the correct answer: We arrived at airport. We realized our passports were still at home.

A. Had we arrived at the airport, we would have realized our passports were still at home.

B. Only after we realized our passports were still at home, did we arrive at the airport.

C. Only when we realized our passports were still at home, did we arrive at the airport.

D. Not until we arrived at the airport, did we realize that our passports were still at home.