What Is the Major Type of Force That Must Be

Multiple Choice

What is the major type of force that must be overcome to allow each of the processes below? I. the evaporation of propanal (CH₃CH₂CH₂OH)
II. the boiling of liquid CH₂Cl₂
III. the melting of solid Br₂
IV. the boiling of liquid BF₃

A) hydrogen bonding, London forces, dipole-dipole, dipole-dipole
B) hydrogen bonding, dipole-dipole, London forces, London forces
C) dipole-dipole, dipole-dipole, London forces, London forces
D) London forces, covalent bonding, dipole-dipole, dipole-dipole
E) London forces, London forces, London forces, London forces