The hellenistic period covers the years between 323 bc, the death of alexander the great, and 31 bc, the suicide of cleopatra. these years are referred to as hellenistic because during this time,

Which of the following  bestillustrates a negative reinforcer?               a.  copland gives up candy to stave off chronic acid indigestion.    b.  nancy learns that she prefers chocolate over vanilla.    c.  carmine changes his major to english lit after failing a math exam.    d.  on a hot day, lindberg always drinks lemonade.