Urgent information such as last-minute exam timing changes must reach students quickly and reliably. Oral announcements in classrooms and at common spaces can spread the message immediately to those present and allow brief clarification questions on the spot.
Option A:
Option A is correct because oral announcements are fast, direct and suitable for time-sensitive updates affecting many students at once.
Option B:
Option B, a textbook chapter, is prepared long in advance and cannot reflect sudden changes in schedule. It is inappropriate for last-minute updates.
Option C:
Option C, a research article, is unrelated to routine administrative communication and would not reach students in time or in an accessible form.
Option D:
Option D, emailing only one random student, is unreliable and inequitable because it does not ensure that all affected students receive the information.
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