Which is true about London forces?

Explanation

London dispersion forces are a type of van der Waals force and are the weakest intermolecular force. They are present in all molecules, regardless of polarity. These forces are more significant in non-polar molecules because they are the only type of intermolecular force present. In polar molecules, dipole-dipole interactions are stronger, but London forces still exist. London forces occur due to the temporary and instantaneous dipoles that arise from electron movement, which can induce a dipole in a neighboring particle, leading to an attraction. Therefore, the correct answer is 'All of the above' because each statement highlights a true aspect of London forces.