Which Order from the Health Care Provider Will the Nurse

Which order from the health care provider will the nurse implement first for a patient who has vomited 1200 mL of blood?

A) Give an IV H₂ receptor antagonist.
B) Draw blood for typing and crossmatching.
C) Administer 1000 mL of lactated Ringer's solution.
D) Insert a nasogastric (NG) tube and connect to suction.