Context: It 's Doctor Who , anyone can come back , anything can be undone , if Rose can come back from another dimension , the Master can survive the Time War and the Daleks can keep escaping certain extinction ... they can get around this plot point should it ever serve them .
Question: what is the reason anyone can come back and anything can be done ?
Option 0: None of the above choices .
Option 1: The reason is they are psychic .
Option 2: They have a contract to do this .
Option 3: Doctor who is a fictional story where time travel and almost anything else is possible .
Answer: 3