During a unit on persuasive writing, a middle school teacher has students write a formal letter to the school principal arguing for a change to a school policy. The teacher evaluates the letters based on the strength of the argument, use of evidence, and adherence to a formal letter format. This assignment is best described as which type of assessment?
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A
A diagnostic assessment
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B
A norm-referenced assessment
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C
An authentic assessment
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D
A summative multiple-choice test