Each of the sentences provided may contain a grammar or usage error. Read each sentence, and then identify its error, if there is one, by selecting the appropriate answer choice. If there is no error in the sentence, choose no error. Although Sonya dances gracefully, her little brother Tomas moves clumsily.

No error.

Explanation:

Punctuation errors, be it in the use of the punctuation signs, or capitalizations, etc. forms one of the most important aspects of correct sentences. And not only that, the subject-verb agreement, the use of the adverbs and adjectives also constitute a correct sentence.

In the given sentence "[A]lthough Sonia dances gracefully, her brother Tomas moves clumsily", there is no error. The adverbs "gracefully" and "clumsily" are correct, describing the way the characters move.

Thus, there is no error in the given sentence.