The best option to complete the sentence with an adverb of manner is: Option 2: fluently
Here's why:
- Yesterday tells us when Heena delivered the speech, not how she delivered it. An adverb of manner describes the way something is done, not the time.
- Fluently describes how Heena delivered the speech. It means she spoke smoothly and easily, without stammering or hesitation. This adverb fits the context of praising her delivery.
- Where tells us the location of the speech, not the manner. We need an adverb that describes Heena's action, not the setting.
- Probably indicates uncertainty, which doesn't fit the tone of the sentence
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