Ethnic conflicts has been a contemporary concern
I think the answer is A
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A megalopolis is<span> typically defined as a chain of roughly adjacent </span><span>metropolitan areas.</span>
The average depth of the Nile is 8-11 meters (±26-36 feet).
That would rule out large ships.
A smaller cruise boat is possible, but there will be other obstacles.
It would be D, because is it was A, it would only affect the person in the house, when hot gas goes out a volcano it would most likely be a sign of global warming, C if it forces a car off the road it won't damage it much. But you are slowly weathering a land form on Earth.<span />