Answer :
Reserved powers refer to power over regulated trades according to the
constitution, these powers regulate trade between states, to control
their production activities and to ensure that everyone works according
to law, through the use of these powers.
The correct answer is They are held by the states alone.
The US Constitution clearly states that any right not given directly to the federal government will belong to the states alone. This is known as a reserved power. This amendment ensures that state governments will have some autonomy over their states and to make laws that they feel are necessary for their population. This was included in the constitution as a means to check the power of the federal government.