According to the passage, which action did the U.S. Supreme Court find constitutional?

In 1989, the court held in Stanford versus Kentucky that the Constitution allows states to impose the death penalty on an offender who is 16 or 17 years old when he committed the crime.

In the interpretation of its terms, we have established the necessity of standards of decency that mark the progress of a maturing society.

The Eighth and Fourteenth Amendments forbid the imposition of the death penalty on offenders who are under the age of 18 when their crimes were committed.

Source: Ropery v. Simmons (2005)

A. The death penalty may be imposed on both adults and juveniles.
B. The death penalty may be imposed only on adults.
C. The death penalty may be imposed only on juveniles.
D. The death penalty may be imposed on neither adults nor juveniles.