B. The writers of the Declaration of Independence
There’s a good source on google if you search this but it’s easy to find on google:)
As long as the German's were fighting a war on two fronts, they couldnt send the resources they needed to the western front, allowing the allies to make some major pushes into occupied territory.
They had similar trading methods and some of the same trading goods
The Kingdom of Prussia (aka "Germany") and the Austrian Empire joined together to seize the territory of Schleswig-Holstein from Denmark due to the regions majority German population.