After Students Graduate from College, What Happens to Their Memory

After students graduate from college, what happens to their memory of a foreign language that they studied in college?

A) They continue to remember it without any loss for the rest of their lives.
B) Their memory fades for the first 3 to 6 years and remains fairly stable from then on.
C) Their memory fades gradually and steadily throughout the rest of their lives.
D) Their memory remains stable for the first 3 to 6 years and then begins to fade steadily from then on.