A submersible temperature sensor takes temperature
readings at three different depths in a lake.
Which data set is the most precise?

A. 5 m depth: 24.5°C, 20°C, 21°C
B. 15 m depth: 18°C, 16°C, 20.0°C
C. 25 m depth: 15.6°C, 15.6°C, 15.9°C
D. 35 m depth: 12.0°C, 18.1°C, 14.2°C