Final answer:
The Rapid Sequence Intubation (RSI) tool used to view vocal cords and facilitate endotracheal tube placement is the laryngoscope.
Step-by-step explanation:
The correct answer to the question regarding Rapid Sequence Intubation (RSI) tools is a. Laryngoscope. RSI is a medical procedure designed to quickly secure a patient's airway in situations where they cannot breathe adequately on their own. The laryngoscope is used to view the vocal cords and facilitate the placement of an endotracheal tube, which could be a tube that allows air to bypass an obstructed area in the respiratory system and reach the lungs.
A stethoscope is another tool mentioned, typically used for auscultation or listening to the internal sounds of the body, such as the heart and lungs, but it is not used for intubation itself. An otoscope is used to view the ear canal and eardrum and a sphygmomanometer is used to measure blood pressure, neither of which are involved in RSI.