Explain:
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A. |
“marked” would not form a meaningful participle clause with by American publishers. |
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B. |
Students are instructed by books. “Instructed” cannot be used to describe textbooks. |
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C. |
“sold”, the past participle of “sell”, forms a participle clause with the words by American publishers to describe new university-level textbooks. |
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D. |
“priced” would need to be followed by an actual price e.g. priced at less than $40, so it is incorrect. |
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