Kids and Cake

"How old are you again?"
--Joe Scheffer (Joe Somebody)

It's time for cake at a seven year old's birthday party.  Several of the child's school friends are there along with parents. When slices of cake are passed around the table, one kid concludes that his slice is the smallest of the lot. The kid prefers more cake.

Responses to this situation include:

a) Cry out, "No fair, they got more cake than I did!" and look to the parents for a more favorable distribution of cake.
b) Take cake from another child's plate.
c) Seek to trade with another kid for a larger slice of cake.
d) Be thankful for the slice received, eat it, and move on.

Which responses are more child-like?

Which responses are more adult-like?