To collect data during an experiment about the transfer of kinetic energy in a sample of water and ice, the most relevant tool would be:
b. thermometer
A thermometer will help her measure the temperature of the water and ice, which is crucial for understanding the kinetic energy of the molecules in both states. Temperature is directly related to the kinetic energy of the particles within the substances. The other tools, while useful for different purposes (measuring volume, length, or mass), are not as directly applicable to the study of kinetic energy transfer.