Okay so I'm not sure exactly if this is talking about primary or secondary sources, but if it is then I'm fairly certain that this would be a secondary source since the student wasn't there to witness it, they're relying on their research to give them information.
The answer is C, Europe , you know ... ( Christopher Columbus )
America , also known as the new world.
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You should pick C) Europe because this is what we learn in school so this is what your teacher wants you to pick.
But if you want to get technical ,
The correct answer is D)South Africa , this can be proven<span />
From my POV D is the answer
To get things that benefit the world like oil and coal.