Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The father of a 14-year-old who was killed by a cannabis-smoking driver as she walked to school has told of his devastation as it is claimed the man was texting when he hit her. Liberty Baker died after being hit as she walked to school with friends in Witney, Oxfordshire, last June. Robert Blackwell, a 19-year-old drug user, was behind the wheel of the speeding Citroen C2 which mounted the pavement where Liberty was walking. Liberty Baker, 14, was killed when Robert Blackwell's speeding car mounted the pavement she was walking along on her way to school last June Liberty's father Paul Baker (left) said he wished he had been killed instead. Her mother, Maureen (right with Finley, Liberty's 10-year-old brother) broke down in tears after today's hearingLiberty Baker was killed as she walked to school in Witney, OxfordshireRobert Blackwell, 19, mounted the pavement in his speeding CitroenHe pleaded guilty to causing death by dangerous driving this afternoonLiberty's father told of the schoolgirl's final moments after the hearingPaul Baker said her death had become a 'living nightmare' for his family 
 Question:The schoolgirl's father today described the 'living nightmare' her death has become as prosecutors claimed _ had been distracted by his phone at the time of the crash.

Robert Blackwell