Pavlov Conditioned Dogs to Salivate at the Sound of a Bell

Multiple Choice

Pavlov conditioned dogs to salivate at the sound of a bell by following the bell with food.How could Pavlov use extinction to eliminate salivating to bells?

A) Present food repeatedly in the absence of the sound of the bell.
B) Repeatedly ring the bell,but never follow it with food.
C) Ring the bell,and then present poison-laced food to induce sickness.
D) Present food only every other time the bell is rung.