C. There were protests in many neighborhoods
It increased the demand for steel since steel was used to make railcars and tracks.
Steel was used to make railroad tracks and cars because it was the only metal strong enough. So the expansion of the railroad industry would mean more steel had to be used and thus it would increase the demand.
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Answer:
An outcome variable (dependent variable) is always affected by the manipulation of a test variable (independent variable).
Explanation: