Majed Is Playing a "Game" Against Rejan,and He Has to Choose

Majed is playing a "game" against Rejan,and he has to choose an option without knowing what Rejan will choose.Majed must choose how much money he will contribute to a common pot instead of putting it in his own account,when having X amount in the common pot will benefit both him and Rejan.This situation is called a(n) :

A) commons dilemma.
B) Prisoner's Dilemma.
C) risky shift.
D) ultimatum game.