A written constitution is important because it limits the overall power of rulers or people with power, and stops them from creating any laws or policies that can be deemed unjust. Imagine a government in which the ruler can be appointed for life and create any law or do whatever he wants. That's why our founding fathers wrote this. To make sure the reason they left Great Britain could never happen in our own government.
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One of the main reasons Christianity is now so popular is because European imperial nations spread it through their conquests, with it being a main justification for many of their ventures. This was the case in both the colonialism seen prior to the Napoleonic wars and the scramble for Africa in the late 1800s. The religion was forced on native peoples who had to abandon their traditional religions, many times for fear of death at the hands of Europeans. The result is several populous non-European nations having majority Christian populations to this day.
The answer would be B, it involved a deliberate effort to eliminate all the people in one ethnic or cultural group.
Genocide is the systematic, deliberate elimination of everyone in a particular ethnic, cultural political, religious, etc, group.