In the Ultimatum Game There Are Two Players: a Proposer

In the Ultimatum Game there are two players: a proposer who offers to share some proportion of a sum of money, and a responder who decides to accept or reject the offer. Which of the following has been documented during studies using this paradigm?

A) When proposers offer to share the money equally, such offers are typically seen as fair and accepted.
B) When proposers offer to give a meager sum (e.g., a quarter of the money) , such offers usually upset responders who reject the offer and consequently end up with no money at all.
C) When responders feel that an offer is unfair this judgment is normally accompanied by activity in the amygdala.
D) All of the above.