In the sentence "To do this, we need to persuade mankind." (Para. 1), "this" refers to ______.

A．is an adherent of some modern ideologies.
B．does not think that the adoption of any ideology could prevent war
C．believes that the adoption of any ideologies could prevent war
D．does not doubt the truth of any ideologies

A．war is the only way to solve international disputes
B．war will be less dangerous because of the improvement of weapons
C．it is impossible for people to live without war
D．war must be abolished if man wants to survive