Not sure if you were ever able to see it, but in case you didn't, I uploaded my attachment to imgur.
However, it looks like you're on the right track with that DOM inspector. Just find your hidden <input> in the body, and verify that it actually has the value that you tried to set.
As you already posted, (d) seems to be working fine. There aren't a whole lot of moving parts in (b) or (c); we're letting jQuery take care of them for us. That just leaves (a)...