Answer:
i think it would be C. or D.
Explanation:
cs earths inner is hot and is full of gasses etc.
I'm not 100% sure but seeing your options i'd say spear
Italy is shaped like a boot that make it good location because a lot of cities were on the water, and cities were a perfect place to sell or trade goods. Hope it help!
I think it is the German policy of unrestricted submarine warfare. All the other ones are major factors.