Barter system- A method of exchange when no money is involved.
B and C can't be the answers because they are not exchanging anything.
D can't be the answer either because there is money involved.
So your answer is A) You trade an apple for a banana at school. because you are exchanging something with someone for something else thats not money.
Hope this Helps!!
<span> Warren Harding defeating James Cox, 1920 (26.17% margin)</span>
Two landmark decisions by the U.S. Supreme Court served to confirm the inferred constitutional authority for judicial review in the United States: In 1796, Hylton v. United States was the first case decided by the Supreme Court involving a direct challenge to the constitutionality of an act of Congress, the Carriage Act of 1794 which imposed a "carriage tax".[2]
The Court engaged in the process of judicial review by examining the
plaintiff's claim that the carriage tax was unconstitutional. After
review, the Supreme Court decided the Carriage Act was not
unconstitutional. In 1803, Marbury v. Madison[3]
was the first Supreme Court case where the Court asserted its authority
for judicial review to strike down a law as unconstitutional. At the
end of his opinion in this decision,[4]
Chief Justice John Marshall maintained that the Supreme Court's
responsibility to overturn unconstitutional legislation was a necessary
consequence of their sworn oath of office to uphold the Constitution as
instructed in Article Six of the Constitution.
