Which statement correctly identifies the cause of this motion and the key deduction about the oil molecules?
The motion is caused by convection currents within the oil due to heating from the microscope light, showing that the oil molecules have a high thermal conductivity.
The motion is caused by electrostatic repulsion between the carbon particles, showing that the oil molecules act as an effective electrical insulator.
The motion is caused by the unequal, random bombardment of the carbon particles by the much smaller, fast-moving oil molecules, showing that the oil molecules are in continuous, random motion.
The motion is caused by the carbon particles absorbing photons and re-emitting them, showing that the oil molecules do not interact with light.
