Choose the selection which correctly identifies the forces which must be overcome to convert SF6 from a liquid to a gas. a) Only London dispersion forces must be overcome. b) Only dipole-dipole forces must be overcome. c) Only London dispersion and dipole-dipole forces must be overcome. d) Only London dispersion and hydrogen-bonding forces must be overcome. e) London dispersion, dipole-dipole, and hydrogen-bonding forces must be overcome.