I heard some cackling in the background ( I hope they were n't watching it on the monitor ) . I tried to do it as quickly as possible . A couple of times , someone tried to open the door .

Question: What is a likely source of the cackling that was heard by the speaker ?
Answer: There is a wild animal inside making this noiseSomeone is choking , making a cackling soundNone of the above choices .Someone is watching them and laughing