In a Science Fiction Story About Hostile Aliens Invading Earth,the

In a science fiction story about hostile aliens invading Earth,the major conflicting political powers join together to combatthe extraterrestrial threat. Generalizing from Muzafer Sherif'sresearch, it would be safe to conclude that this act of cooperative behavior would lead to:

A) cognitive dissonance on a national level rather than on a social group level.
B) alienation, antagonism, and increased levels of conflict once the threat is over.
C) increased conflict over which group should get the most credit for defeating the aliens.
D) reduced conflict and increased harmony between the major powers.