The incorrect word in the sentence is "quitely" (A), which is a misspelling. The correct word should be "quietly", which means "in a silent or hushed manner."
• "Quitely" (incorrect) is a spelling mistake; the correct word is "quietly", which correctly describes how the librarian instructed the students.
• "Maintain" (correct) is used properly as it means to continue or uphold a certain state, in this case, silence.
• "Reading" (correct) is appropriately used as it describes the action of the students.
• "Library" (correct) is correctly used as the place where the event is taking place.
• "All are correct" (incorrect) because "quitely" is incorrect.
Hence, option (a) is the answer.
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