The halo effect occurs when an overall positive impression of a person leads us to evaluate specific behaviours more favourably than they deserve. In the stem,the teacher lets one impressive answer influence judgement of later responses. This is a textbook case of the halo effect.
Option A:
Pygmalion effect relates to self fulfilling prophecies based on expectations,which is related but distinct.
Option B:
Halo effect shows how initial impressions bias later communication and evaluation,making option A correct.
Option C:
Hawthorne effect involves behaviour change because people know they are being observed,not because of prior impressions.
Option D:
Contrast effect means judging a person relative to another,not simply carrying over one positive impression.
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