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: A British woman told today of her horror at finding her two best friends shot dead on a sofa at a villa in Spain. Peter Tarsey and his wife, Jean, both 77, were found covered in a green raincoat, each killed with a single bullet in a double murder of 'terrible cruelty'. The friend, Ann, said she had gone to the house on Sunday afternoon with another friend because she was concerned at not being able to reach the couple on the phone. The expat, who had been friends with the couple for 25 years, said: 'I knew something was wrong as soon as we got there. What we found was like something out of your worst nightmare.Peter Tarsey and his wife, Jean, both 77, each killed with single bulletFriends went to their villa after being unable to reach them on phoneThey found them in each other's arms 'like he was protecting his wife'British expat friend: 'It was like something out of your worst nightmare' 
 Question:_, who asked for her surname not to be published, said she 'can't imagine' who would want to kill them, adding: 'They were such a lovely, friendly couple who would do no harm to anyone.'

Ann