So the obvious answer would be the one that was soaked in water.
But what comes next? The toasted one? The untouched one? Some
challenge that if a toasted piece of bread was put into the plastic
bag when hot, it will decompose faster than the one that is
untouched. However when cold, it is so dehydrated it will keep
longer. So parents are complaining about the ambiguity of the
questions, and that their children were stumped. The forum pages in
the Straits Times for the past few days have been filled with
similar complaints, and most of it complained about questions that
“have never been seen or taught.”
http://lovelyloey.wordpress.com/2007/10/13/psle-questions/
No, the intention of the question is to tell you that the
toasted bread lacks the moisture content and is the least "wet" of
them all.
Intelligent students IMO will know that toasted means less moisture
content, only smart alec parents will think otherwise...