The Nurse Is Reviewing Findings from a Patient's Chart

The nurse is reviewing findings from a patient's chart. Which of these manifestations should a nurse investigate first when assessing this patient? Exhibit 1: Laboratory Report: Serum sodium 115 mEq/L
Exhibit 2: History and Physical: Patient reports fell from bicycle and struck head five days ago.
Exhibit 3: Graphics Record: Pulse 100. Blood Pressure 140/9

A) Patient is lethargic and difficult to wake .
B) Patient states, "I feel thirsty."
C) Patient states, "I have a headache."
D) Patient's urine is dark amber in color
E) Previous 24-hour intake and output - 3,500 mL in.1,500 mL out.