【单选题】

Which of the following signs and symptoms would alert the nurse to possible internal bleeding in a client who has undergone pulmonary lobectomy

A、Increased blood pressure and decreased pulse and respiratory rates.
B、Sanguineous drainage from the chest tube at a rate of 50 mL per hour during the past 3 hours.
C、Restlessness and shortness of breath.
D、Urine output of 180 mL during the past 3 hours.