Once Glucose Has Entered a Cell,what Prevents It from Diffusing

Once glucose has entered a cell,what prevents it from diffusing back out of the cell?

A) glucose pumps actively pump it back
B) one side of the cell membrane is permeable to glucose, but the other side is not
C) glucose inhibitors attach to glucose once it's in the cell
D) glucose is phosphorylated preventing it from leaving the cell
E) glucose is hydrolyzed into two three-carbon molecules that cannot diffuse in a reverse direction