The pair that represents the similar relationship is as of the Poison: toxic is Perform : Achieve. Thus last option is correct.
Synonyms refers to those words which has the similar meaning. They can have almost the same meaning for example:- The word happy has the synonyms as joyful , cheerful etc.
The pair that best exemplifies a similar relationship is Perform: Achieve. Therefore the correct option is last one.
Learn more about Synonyms here:
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