Final answer:
A laryngoscope and a Yankauer-tipped suction are likely the clinicians' first choice for placing an endotracheal tube in a patient with blood in the oropharynx.
Step-by-step explanation:
The likely first choice for placing an endotracheal tube in a patient with blood in the oropharynx is a Laryngoscope and a Yankauer-tipped suction. The laryngoscope is a device used to visualize the vocal cords and other structures in the throat, while the Yankauer-tipped suction is a suction instrument used to remove blood and debris. By using these tools together, the clinicians can effectively clear the oropharynx of blood and safely place the endotracheal tube.