Which is the best answer, would you say? Click on its number.
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Time is an illusion anyway.
If it was possible we would have met at least one time-traveller by now.
When you try and think about time travel in detail you always end up contradicting yourself.
Once you have understood the meanings of the words you can see that there is a contradiction in saying that time travel is possible.

Which of the following is the strongest argument do you think against the possibility of time travel?

You will find (1) seriously argued for, but to me it is strange to think something so interesting could be ruled out on linguistic grounds like this. But (2) sounds stronger? There is always that moment when you confront - yourself!

I think (3) is a good point, but inconclusive (have you actually seen a black swan?). I suppose (4) if true would constitute a (conclusive) argument against the possibility of time travel, but it's quite a teapot itself.

Score?