SO.......... they had to build across multiple different terrains. A few times they even had to dig through sections of mountains
The answer is A.
Rockefeller worked with oil, Vanderbilt did the railroads, Carnegie was leader of the American steel industry, and Astor did fur trade and invested in real estate.
Answer & Explanation:
Free Exercise Clause refers to the section of the First Amendment italicized here: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof... Historically, the Supreme Court has been inconsistent in dealing with this problem.
A- Trade
Explanation
(The internet told me so:))