In Making Higher Than the Minimal Offer in the Ultimatum

In making higher than the minimal offer in the ultimatum game, proposers are more concerned with being rejected for making small offers rather than any concerns of being observed by the experimenter. We know this because:

A) Offers in the impunity game where there is no punishment option for the receivers are lower than those in double-blind anonymity games (making sure that no one can learn about proposer offers) .
B) Offers in the impunity game where there is no punishment option for the receivers are higher than those in double-blind anonymity games (making sure that no one can learn about proposer offers) .
C) Offers in the ultimatum game are lower than those in the dictator game.
D) Offers in the ultimatum game are higher than those in the dictator game.