Answer
A represents London dispersion forces, which are weaker than the force represented by B.
Explanation
London dispersion, also called van der Waals forces are caused by the distribution of electrons throughout the molecule/atom of the compound. It is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. This force is sometimes called an induced dipole-induced dipole attraction. London forces are the attractive forces that cause nonpolar substances to condense to liquids and to freeze into solids when the temperature is lowered sufficiently.
According to the given chart, the statement which correctly identifies the intermolecular force represented by A and compares its strength relative to the intermolecular force represented by B is: A represents London dispersion forces, which are weaker than the force represented by B.
Hence, the first option is the correct answer.