Farmers mastered irrigation early, providing more crops than they needed to support the population.
A is wrong, as if you check, John Adams' presidency was from 1797 to 1801--only a single four year term.
B is true. Since George Washington made the Proclomation of Neutrality before him, John Adams ended up having to uphold it. There's a famous debacle called the <em>XYZ </em><em>Affair</em> where US diplomats were stopped from talking to the French foreign minister by his agents unless they paid a hefty bribe. (whose names were replaced with X, Y, and Z when Adams released the documents so as to avoid involvement in French wars)
C is wrong. John Adams' wife, Abigail Adams, had been married to Adams for over thirty <em>years</em> before he took office.
D <em />is wrong. The Louisiana Purchase was in 1803, during which the third president, Thomas Jefferson, was in office.
the answer is C they were looking for a safer route to East Asia through the Americas
