Kinetic energy of particles in a substance is directly related to its temperature. The lower the temperature, the lower the kinetic energy.
From the table, the temperatures of the water samples are:
- Sample 1: 98.2 °C
- Sample 2: 46.0 °C
- Sample 3: 100.6 °C
- Sample 4: 31.4 °C
Sample 4, with a temperature of 31.4 °C, has the lowest temperature and therefore has the lowest kinetic energy.
The correct answer is 4.