Read the passage: 'The clinic's waiting room was filled to capacity. Patients coughed into their sleeves and clutched paperwork. The receptionist typed rapidly without looking up. Several people had been waiting for over an hour.' Based on this passage, what can be reasonably inferred?
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A
The clinic is understaffed or overwhelmed with patients.
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B
The patients are all experiencing emergency medical conditions.
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C
The receptionist is rude and incompetent.
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D
The clinic is about to close for the day.