My husband didn’t leave the car keys, so I couldn’t pick him up at the station. (If)

A. If my husband left the car keys, we could pick him up at the station.

B. If my husband hadn’t left the car keys, we could have picked him up at the station.

C. If my husband had left the car keys, we could have picked him up at the station.

D. If my husband has left the car keys, we could have picked him up at the station.