It soon became apparent that there was nothing mystical about the vanishing of Donna Noble . Down on the coast was a small dock , barely noticeable from the cliff top where we had previously stood . In a bid to make a quick buck , and raise themselves from the poverty they were forced to inhabit ; a few local people had set up a Ferry business , taking holiday makers over to the next island for ridiculously high prices . The reason why Donna 's DNA trail vanished , was because the ocean had taken away any trace of her .

Question: What might have happened before this disappearance ?
Answer: The police investigated Donna Noble 's disappearance and concluded that she had mystically vanished .None of the above choices .The police investigated Donna Noble 's disappearance and concluded that she had taken a ferry .Someone reported Donna Noble 's disappearance and then her body was found at the cliff top .