Answer:
Option C.
Step-by-step explanation:
The invasion of Belgium, is the right answer.
The invasion of Belgium by Germany was a militant operation that began on August 4, 1914. Throughout the course of World War II, Franklin D. Roosevelt, the then President of the United States pledged that the U.S. would “prevail as a neutral nation". Nevertheless, American public sentiment turned against Germany, when this nation invaded Belgium, a land that notwithstanding being nonpartisan was attacked on 10 May 1940.