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I think it is already written the way you want. if not please explain more :)
Answer:
C) An author will use a tone, to impart a certain effect to influence readers, such as using negative tones on a topic they feel strongly against, hoping to influence the reader to have the same beliefs.
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Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms.
They felt it was unnecessary