Diagnostic evaluation ascertains

AThe student's performance at the beginning of instruction

BThe causes and remedies of persistent learning problems during instruction ✓ Correct

CThe degree of achievement of instructional objectives at the end

DThe learning progress and failure after instruction

Correct answer: (B) The causes and remedies of persistent learning problems during instruction

Explanation

Diagnostic evaluation identifies the causes and remedies of recurring learning difficulties as instruction proceeds.

Performance at the beginning of instruction (A) describes placement or pre-assessment.

Achievement of instructional objectives at the end (C) describes summative evaluation.

Learning progress and failure after instruction (D) describes follow-up, not diagnosis.

It probes the underlying weakness behind repeated errors rather than assigning a grade.

Diagnostic testing usually follows formative checks that flag persistent problems.

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