I did n't have a house key , either . I think it was winter and I was very cold . I kept walking from the backdoor to the front door hoping that one of them would miraculously become unlocked .

Question: What 's a possible reason the writer did n't have a house key ?
Answer: None of the above choices .Because they forgot to bring it with them .Because it was winter and very cold .Because they kept walking from back door to front door .