'Ramping' Is Defined As

'Ramping' is defined as:

A) long waiting times for patients in emergency departments
B) a chain reaction occurring when large numbers of people present to an emergency department at one time,preventing admission of those patients who have arrived by ambulance
C) an ambulance that is reverse parallel-parked outside an emergency department
D) A flow-on effect of patients overwhelming an emergency department instead of making a general practitioner appointment for illnesses such as colds or flu