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A. oxymoron 
because sound and silence are opposites in meaning but are used together in this phrase.

Figures of speech enhance the meaning of the words in a text as they help the reader to have a vivid imagination of the thoughts expressed. The sound of silence filled the room is an example of;

  • A. Oxymoron

An oxymoron is used when two words that have contradictory meanings are used together in a text. Silence connotes the absence of sound.

So, when these two words that have contradictory meanings are used together, an oxymoron has been used.

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