Biology

The correct answer is: A.Lipids.

Explanation:

1.The cell membrane is primarily composed of a phospholipid bilayer, which forms the structural foundation of the membrane.

2.Lipids, specifically phospholipids, are arranged in two layers (the bilayer), with their hydrophobic (water-repellent) tails facing inward and the hydrophilic (water-attracting) heads facing outward, interacting with the aqueous environment inside and outside the cell.

B.Proteins are embedded within or attached to the lipid bilayer, where they perform functio...