If You Could Add a Colored Label to One Phospholipid

If you could add a colored label to one phospholipid in the cell's plasma membrane to observe this molecule,what kind of movement of the molecule would you see?

A) The molecule would move rapidly back and forth across the surface of the membrane.
B) The molecule would be locked in place by its tightly packed neighbors in the plasma membrane.
C) The molecule would be converted back and forth between a receptor protein and a phospholipid.
D) The molecule would move back and forth between the membrane and the surrounding watery solution.
E) The molecule would flip back and forth from one layer of the membrane to the other.