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: Commander Adama:  Do you think for one centon I believe you ?
Baltar: You do n't have a choice , Adama . If my demands are not followed to the letter within one centare , I 'll kill these hostages one by _ one _ in front of you . Beginning with Lieutenant Boomer .

hostages