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 about the possibility of rejection rather than about being altruistic to the responder. We know this because:

A) Offers in the ultimatum game are typically higher than those in the dictator game.
B) Offers in the ultimatum game are typically lower than those in the dictator game.
C) Offers in the ultimatum game are higher under single-blind protocols than under double-blind protocols.
D) Offers in the ultimatum game are lower under single-blind protocols than under double-blind protocols.