The first American state that ended the practice of death penalty is______.

A．resulted in a sharp decrease of executions ever since
B．led to a number of erroneous executions
C．showed that the Supreme Court was authoritative on death penalty
D．caused a constitutional argument over the morality of death penalty

A．Death penalty is not humane.
B．Death penalty cannot really deter criminals.
C．Possible error in conviction of some offenses.
D．Death penalty was used to suppress revolutionary groups.