excuse me, but can you please tell us the whole exercise / question so we can answer?
Guessing the words you are comparing are "plain" and "plains" the correct answer is C. Homophone; the two words are pronounced the same but have different meanings and sometimes different spellings. Because <em>plain</em> and <em>plains</em> are words that sound alike; but they have different meanings as in "<em>plain</em> cream cheese" the word plain means to be pure while the word <em>plains</em> in the part "crossing the plains in Kansas" is referring to the extensive area of Kansas country; lastly they have slightly different spellings as plain and plain<em>s</em>.
Option A. Homograph is wrong because the correct definition is two words are written the same, not pronounced the same.
Option B. Homophone is wrong because the correct definition is two words are pronounced the same, not written the same.
Option D. Homograph is wrong because in this case they are written the same as the <em>bear </em>(the verb to carry) and the <em>bear </em>(the animal). But for <em>plain</em> and <em>plains</em> they are not identical as one has a <em>S.</em>
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Answer:
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 <em>"[A]lthough Sonia dances gracefully, her brother Tomas moves clumsily"</em>, 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.