The best item is letter B: to protect against future economic crises.
Answer: trenches. WW1 is famous for its trench warfare- a dangerous form of warfare that resulted in a lot of deaths as stalemates lasted for months.
Answer:
I'm not very sure but I think it's C
Explanation:
Islam spread quickly because its leaders conquered surrounding territories. ... Islam spread quickly because its lands were well governed and orderly. The rulers of Islamic lands were expected to rule their land fairly and some of their methods are very similar to ideas in the US government today.