What is the normal range for adult body temperature?

The normal range for adult body temperature is typically defined as being between 97°F and 100.4°F, which corresponds to 36.1°C to 38°C. This range is established based on extensive research and clinical observations that suggest a healthy adult's body temperature can fluctuate due to various factors, including the time of day, level of activity, age, and even hormonal changes.

Choosing this range as the correct answer aligns with the accepted medical guidelines used in healthcare settings. It's important to note that while the average normal body temperature is often cited as 98.6°F (37°C), individual variations can lead to slightly different readings, making it reasonable to encompass this wider range.

The other options provided don't accurately reflect the established medical understanding of a normal body temperature range for adults, as they either present values that are too low or too high, or expand the range too broadly, incorporating temperatures that are typically considered abnormal or indicative of fever. This understanding is crucial for nursing assistants and healthcare professionals when assessing patients' health status.