The correct option is D A, B, C and D
Option (D) is correct. Enzyme activation, energy source, emulsifiers, vitamin carriers, all are the important biological roles of lipids. Lipids are one of the most important constituents of cell membrane. These maintains the selectivity of the cell membrane. It also helps in permeation of selective biomolecules inside and outside of the cell, regulating cell activities by hormone actions, chemical messengers, storage and provision of energy.