why can oxygen diffuse across a cell membrane but a protien cannot?

Aoxygen is polar unlike proteins
Bproteins asre blocked by protien channels
Cproteins are smaller than oxygen
Doxygen is smaller than proteins

Verified Answer :

Vimal1

The answer is D. oxygen is smaller then proteins.

i think the answer is D because since it's smaller it is easier to get pass the cell membrane proteins is bigger so it's harder