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Driving cars lowers the pH of the oceans by releasing CO that dissolves and forms acid in the oceans. The answer is letter C. CO is soluble in water that is why it readily reacts with  sea water to form acid. Forming an acid in the ocean, lowers the dissolve oxygen and thus lowers the pH.

Driving cars lowers the pH of the oceans by the release of carbon dioxide. The effects of carbon dioxide is further described below

The effects of carbon dioxide on ocean

The combustion of fuel by the automobile engines lead to the release of carbondioxide into the atmosphere causing smog and pollution of air.

Excess carbondioxide is being absorbed into the water ( ocean) and prolonged absorption of carbon dioxide in the ocean leads to decrease in the pH of the ocean ( acidity of the ocean increases).

Learn more about acidity here:

https://brainly.com/question/172153

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