Final answer:
(c) Rectal temperatures provide the most accurate readings of the body's internal temperature, and advances like infrared ear thermometers offer rapid and accurate measurements.
Step-by-step explanation:
The most accurate temperature reading of someone's body temperature is considered to be a rectal temperature. Rectal temperatures are generally thought to be the most accurate reflection of the body's internal temperature. For example, infrared ear thermometers, which use technology developed by the Diatek Corporation and NASA, are placed in the ear canal and measure the infrared radiation emitted by the eardrum.
High-end infrared thermometers provide rapid and accurate readings and are particularly useful for newborn, critically-ill, or incapacitated patients due to their non-contact nature and speed of use.