I kinda inferred that the subject is aware on how their decision will impact the future of the experiment (ie that it will be the basis of which option is removed). I first time almost read it as if a random choice was removed and the focus would be whether which one was removed impacted their opinions.
I am also unclear on what significance the choice is supposed to be. If I choose a toy to play with for 5 minutes, 3 hours or get to own after the experiment those are kinda different choice situations.
No, the subject expects the experiment to end with him being able to make a meaningful choice, but unbeknownst to him it is scheduled to take a different turn. He doesn't know that an option will be taken away, much less which one and on what criterion.
The "demo" time is included to help him decide which one he would then take home.
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