On 7 March 1936 German troops marched into the Rhineland. This action was directly against the Treaty of Versailles which had laid out the terms which the defeated Germany had accepted. This move, in terms of foreign relations, threw the European allies, especially France and Britain, into confusion.
When people started domesticating animals, they realized they should not live as nomadic hunter-gatherers. The answer to the question is B. Hope this helps you!