It seems to me that, the thing wthat <span>the author has done in order to create a tone of seriousness in this piece is </span>a fact that he has used a long sentence with complex syntax to ask the reader to pay close attention.
Even though you haven't shared any options to choose the correct one, I bet this one will suit the question.
Regards.
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Answer:
A, gives the reason how the games are helpful.
Parallel
Explanation:
The equations have the same slopes, but different y-intercepts.
Answer:
The author uses the name changes to suggest that the whole planet has been just a brand for centuries. The name changes show how widespread marketing and merchandising are on Earth - in the future and now.
Explanation: