Studies of Long-Term Memory for Material Learned in Cognitive Psychology

Studies of long-term memory for material learned in cognitive psychology classes indicate that

A) 10 years from now you will not remember anything that you now know.
B) 10 years from now you will remember almost everything you know now.
C) 10 years from now you will remember about 25 percent of what you know now.
D) 10 years from now you will remember about 50 percent of what you know now.