The kinetic energy of the water molecules is directly related to the temperature of the water. Lower temperatures mean lower kinetic energy.
In the table, the temperatures of the samples are:
- Sample 1: 98.2 °C
- Sample 2: 46.0 °C
- Sample 3: 100.6 °C
- Sample 4: 31.4 °C
Among these, Sample 4 has the lowest temperature at 31.4 °C.
Therefore, Sample 4 has the lowest kinetic energy.
The correct response is: 4