Listen to this announcement from a school librarian:
'Good morning, students. Please listen carefully. Next week is our annual Book Fair. To prepare, the library will be closing one hour early every day this week, at 3:00 PM instead of 4:00 PM. This will give our volunteers time to set up. Also, please remember that all overdue books must be returned by this Friday to avoid fines. We want everyone to have a clean slate for the fair. Thank you.'
What is the main purpose of this announcement?
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A
To ask for student volunteers to help set up.
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B
To inform students about the library's temporary change in hours.
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C
To announce the specific dates of the annual Book Fair.
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D
To remind students that fines will increase next week.