Question

the practice of selective incorporation means that the bill of rights will
always be applied to the states by the court.
never be applied to the states by the court.
sometimes be applied to the court by the states.
sometimes be applied to the states by the court.

Explanation:

Selective incorporation is a legal doctrine where the Supreme Court applies parts of the Bill of Rights to the states through the Due Process Clause of the 14th Amendment. It is not an all - or - nothing application. The Court has gradually incorporated certain rights over time, not all at once. So, it is not "always" (as some rights were incorporated later and not immediately for all states in all cases) or "never" (since many rights have been incorporated). Also, it is the Court applying the Bill of Rights to the states, not the states applying to the Court.

Answer:

sometimes be applied to the states by the Court.