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, you would see this phospholipid molecule:

A) moving rapidly back and forth across the surface of the membrane in which it was initially located.
B) locked in place by its tightly packed neighbors in the plasma membrane.
C) converted back and forth between a receptor protein and a phospholipid.
D) moving back and forth between the membrane and the surrounding watery solution.
E) flipping back and forth across the membrane.