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Successful attempts to make the internal combustion engine more efficient in the 19th century resulted in an increase in the demand for

A) coal
B) iron ore
C) petroleum
D) arable land

User GDroid
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2 Answers

3 votes
That would be C) Petroleum.
User Rahul Pamnani
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3 votes
The answer to your question is C. petroleum
User MKroehnert
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