A student repeatedly fails to understand fractions despite receiving corrective explanations, additional examples, and classroom practice. The teacher now seeks a detailed investigation into the underlying cognitive and instructional causes of the persistent difficulty. Which assessment is most appropriate?

A. Placement assessment
B. Formative assessment
C. Diagnostic assessment
D. Summative assessment
Correct Answer: C. Diagnostic assessment

Diagnostic assessment investigates the underlying causes of persistent learning difficulties that ordinary corrective teaching has not resolved.

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