Which of the following best describes why ice has a lower density than liquid water? choose 1 choose 1 (choice a) a hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state. (choice b) b because water changes from its polar form as a liquid to its nonpolar form as a solid. (choice c) c the water molecules have less atomic motion than ice. (choice d) d there is more space between individual atoms at lower temperatures, which means colder water has a lower density.