The answer is C. A and B only
On August 31, 1935, Congress passed<span> the first </span>Neutrality Act<span> prohibiting the export of “arms, ammunition, and implements of war” from the United States to foreign nations at war and requiring arms manufacturers in the United States to apply for an export license.</span>
Well the cause of a certain event in history will mean something happens.
The effect is the result of the event happening
For example. With 9/11 the cause was the twin towers collapsing. The effect would have been thousands of people dying as the result of the planes being highjacked