In the Ultimatum Game

In the ultimatum game:

A) is a multi-stage game where one player (the proposal) offers to give the second player (the recipient) some share of a fixed prize; the recipient then decides whether to accept or reject the proposal.
B) is a single-stage game where one player (the proposal) offers to give the second player (the recipient) some share of a fixed prize; the recipient then decides whether to accept or reject the proposal.
C) is a multi-stage game where one player (the proposal) divides a fixed prize between himself and another player (the recipient) who is an passive participant.
D) is a single-stage game where one player (the proposal) divides a fixed prize between himself and another player (the recipient) who is an passive participant.