Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Jenny Ryan:  So you do n't know where he is ?
Kate Beckett: Um ... no . But we are going to find him , and , um ... we do n't believe that he 's in any immediate danger .
Jenny Ryan: Why would he do a thing like this ? Maybe he thinks he has something to prove , 'cause of all of our ... pregnancy stuff .
Kate Beckett: You know , I think that there are probably a number of reasons , but the main _ one _ is that he just wants to do the right thing . I mean , that 's who he is , that 's why he became a cop , that 's why you fell in love with him .
Jenny Ryan: I just want him to come home .

reasons