A teacher wants to assess her intermediate-level students' communicative competence in a practical, real-world context. Which of the following assessment tasks would be most effective for evaluating the students' ability to use language for a specific communicative purpose?
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A
A vocabulary quiz matching words to their definitions.
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B
A cloze exercise focusing on the correct use of past tense verbs.
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C
A role-playing activity where students must negotiate returning a faulty item to a store.
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D
A read-aloud task where students read a prepared, unfamiliar passage.