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A sentence that uses the superlative adjective correctly is Robbie was best than Angelica at playing the piano.
What do you mean by an adjective?
An adjective refers to the words that describe something unique qualities of nouns.
A superlative adjective is used to describe the highest and lowest limit of one quality. In this type of sentence, est is added at the end of one syllable adjective.
Therefore, A is the correct option.
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