can you help me solve this riddle about castaways thank you?

[romancekenyota]

Three castaways were starving on a desert island. When they had run out of food they decided that one of them had to die to be eaten by the the other two. All three were single, of same age, experience, size and skills. but they easily decided who should die. How? Does anybody know the answer if ur answer is right than ill post another question and pick yours as best answer.....thank you

[pir8]

they were kids and they ate the dog ...
:OP
I'm just kidding, I don't know.
oh well.
have a nice day anyhow!

[Conan]

it makes no sense but i guess if two were males they would keep the female