How Have International Norms Against the Death Penalty Affected the U.S

How have international norms against the death penalty affected the U.S. Supreme Court?

A) The international movement against the death penalty was cited by the Court as one reason for banning the execution of juveniles.
B) International norms do not affect the Supreme Court.
C) International norms have caused the Supreme Court to ban the death penalty.
D) International norms were cited by the Court as one reason for banning lethal injection.