What was the effect of the attack of pearl harbor

A. Germany and Italy declared war on Japan
B. The United States declared war on Japan
C. Japan declared war on Italy

I believe the answer is B. at first the United States wasn’t involved in the war but after the actions of Japan they declared war.

I’m not so very sure but I think this is it

The question of what caused the full effects of the radical stage, also called the second french revolution by some historians, which shook the political and social reforms in france have caught the attention of many scholars, particularly because of principles implemented during this stage which is contradictory to the fundamental principle of the french revolution itself, by using dictatorship to create equality.