Essay-type tests are not reliable because

ATheir answers are different

BTheir results are different

CTheir checking is affected by the examiner's mood ✓ Correct

DTheir responding styles are different

Correct answer: (C) Their checking is affected by the examiner's mood

Explanation

Essay-type tests are unreliable because their checking is affected by the examiner's mood and subjectivity.

The same answer may earn different marks from different examiners, or even the same examiner at different times.

Saying their answers are different is natural in essays and not the cause of unreliability.

Saying their results are different merely restates the outcome without naming the cause.

Saying responding styles differ describes variety in students, not scorer inconsistency.

This scorer-based variability is why essay tests have low scorer reliability compared with objective tests.

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