'Efficiently' is an adverb correctly modifying the verb 'performed'. In the other options, adjectives are wrongly used instead of adverbs (e.g., 'looks beautiful' is correct, not 'looks beautifully' when referring to appearance).
Explanation:
A noun or noun phrase used to modify a verb directly, indicating extent, distance, or duration, is called an Adverbial Accusative or Adverbial Objective.
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