"Capital punishment" most probably means ______.

A．Professional killers should not be treated with humane treatment.
B．The violent robbers should think twice before pulling the trigger.
C．We should give the poisoner time to ponder about while he is shaking up or serving his arsenic cocktail.
D．Severe punishment, even death penalty, should be given to criminals.

A．ironical
B．critical
C．agitated
D．controversial