German used submarines, called U-boats
I'm not quite sure about my answer, so I may be incorrect, but I think the answer would be C.
I'm just going with my gut instinct right now, so I may be incorrect.
The answer is Court of International Trade.
Groups ranked as artisans in emerging social hierarchies in early river civilizations were known as 'Skilled Craftsmen'.
In societies with rigid hierarchies, a craftsman had a better social standing than the ordinary peasant. A Skilled craftsmen could hope to make more money, earn more respect and even get a chance at climbing the social ladder.
Highly skilled craftsmen including carpenters, musicians, architects and painters. Some of the best were supported by the Kings of the era and could made a comfortable living.
