A number of clients on a geriatric subacute medical floor of a hospital have developed foul-smelling ...

A number of clients on a geriatric subacute medical floor of a hospital have developed foul-smelling diarrhea over the last several days, and subsequent culture of stool samples has confirmed the presence of Clostridium difficile in each case.
 
  The care team in the unit would recognize that which of the following factors likely contributed to the health problem and would anticipate which of the following treatments?
  A)
  The use of broad-spectrum antibiotics likely played a role in the development of infections, and most clients would likely receive metronidazole as a treatment.
  B)
  Genetic predisposition and the presence of the bacterium in clients' normal flora likely contributed, and treatment would consist of broad-spectrum antibiotics.
  C)
  Poor hand washing practice on the part of care providers led to the outbreak, and treatment will consist of hydration and nutritional support.
  D)
  Ingestion of contaminated food probably contributed to the infections, and corticosteroids will be needed to treat them.