Which of these is closest to normal human body temperature, in degrees Celsius?

Normal human body temperature, also known as normothermia or euthermia, is a narrow temperature band indicating optimal health and thermoregulation. Individual body temperature depends upon the age, sex, health, and reproductive status of the subject, the place in the body at which the measurement is made, the time of day, the subject's state of consciousness (waking or sleeping), activity level, and emotional state. Despite these factors, typical values are well established: oral: 36.8 ±0.4°C (98.2 °F), internal: 37.0 °C (98.6 °F).

Normal human body temperature varies slightly from person to person and by the time of day. Consequently, each type of measurement has a range of normal temperatures. The range for normal human body temperatures, taken orally, is 36.8±0.5 °C (98.2±0.9 °F). This means that any oral temperature between 36.3 and 37.3 °C (97.3 and 99.1 °F) is likely to be normal.