Its the science of determining the age of rocks and geological events.
I'd say overall B. It basically gives the reader general concepts and main key summaries, tipping them off on what the essay would most likely be like. It stars a hook (something to hook the audience into reading.) but thats not what its for. A seems irrelevant to what an intro is.
Therefore the most likely answer is b.
The answer is C, CHIUNE: And if the Nazis find out . . . You and the children must return to Tokyo immediately. <span>
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Its like a heads up, let you know before hand.