Phospholipids Make Up Most of the Lipid Part of the Cell

Multiple Choice

Phospholipids make up most of the lipid part of the cell membrane.Since water exists on both the outside and inside of a cell,which of the following phospholipid arrangements makes the most sense?

A) a single layer of phospholipids with the polar heads facing outside the cell
B) a single layer of phospholipids with the polar heads facing inside the cell
C) two back-to-back phospholipid layers with the polar heads facing out on both sides
D) two back-to-back phospholipid layers with the non-polar tails facing out on both sides