Acetone CH₃COCH₃ boils at a Significantly Higher Temperature Than 2-Methylpropane

Acetone CH₃COCH₃ boils at a significantly higher temperature than 2-methylpropane isobutene

A) because dipole-dipole forces are always greater than dispersion forces.
B) because the molecular mass of acetone is slightly less than that of 2-methylpropane.
C) because the density of acetone is greater than that of 2-methylpropane.
D) because the attractive dispersion forces in 2-methylpropane are weaker than those in acetone.
E) because the attractive dispersion forces in 2-methylpropane are weaker than the dipole forces in acetone.