Answer:
The correct option is C) oxygen gas
Explanation:
The cell membrane is a phospholipid bilayer membrane which is selectively permeable. This selectively permeable membrane allows the movement of small, uncharged molecules or substances easily through it by the simple method of diffusion. Hence, among the options mentioned, oxygen gas which is small and uncharged will be easily be able to pass through the cell membrane by the process of diffusion. Other molecules, like large molecules, require other methods such as carrier proteins for movement across the cell membrane.
