I'm having trouble understanding your description of the experiment. How does selecting C over B, after initially preferring B, support the thesis that random choices become preferences? Shouldn't the baby select B over C to support that thesis?
The idea is that the baby selected the box they believed contained B, but it actually contained A. Apparently the baby concluded that since they had opened the box that they chose, they must have chosen the toy inside, and they now like A better and B worse.
I'm having trouble understanding your description of the experiment. How does selecting C over B, after initially preferring B, support the thesis that random choices become preferences? Shouldn't the baby select B over C to support that thesis?