Answer:
a
Explanation:
all of the other answers literally dont make since so if you eliminate the others its a.
It might be said that the use of the vernacular (option B) "<span> helped writers and philosophers reach wider audiences". This term is associated with the native language or (native) dialect a population have. It is also known as lingua franca or vernacular language. As using a well-known language it is easier for people to understand and so the text might get to more people, audiences. </span>
One way in which the completion of the Transcontinental Railroad affected companies that made products was that "<span>Companies could ship goods cheaply over long distances," which greatly increased profits. </span>
Overpopulation caused the migration