The best and most correct answer among the choices provided by your question is the second choice which is "railroad tracks."
<span>By 1860 the Midwest and the East were united by a network of railroad tracks.</span>
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A. The present
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Muhammed Avdol from Jojo's Bizarre Adventures
<span>Based on my research, Aristotle believes that his "Prime Mover" is God. He believed that everything that has happened, every "cause", had to have a cause before it. Something had to cause the first cause. However, the first cause can not be in the same formula or be part of the same equation. The rules of the first cause can not applied to the "causer" of the first cause. God has no beginning or end so time doesn't apply to God.</span>
C. nations compete to build the most weapons.
