From What Substance Do Liposomes Spontaneously Form and Why Are

From what substance do liposomes spontaneously form and why are they important?

A) Liposomes spontaneously form from DNA and proteins and provide a rigid structure to support the cell.
B) They are formed from phospholipid monolayers.These phospholipid monolayers provide a stable barrier between the internal and external environments.
C) Liposomes were the first rigid cell walls providing support for the living cell and a barrier between the external and internal environments.
D) Liposomes form from phospholipid bilayers and provide a barrier between an external environment and an internal environment;this creates an internal environment where specific chemical reactions needed to establish a living cell can occur separately from the external environment.