Instead of studying one subject at a time, you study each one briefly, then return and study each one again, and continue repeating. Compared to studying all at once, what is your result?

a. Studying will seem more difficult, but you will remember better later

b. Although you will seem to remember well, your memory will fade later.
c. You will confuse one topic with another and remember none of them well.
d. Your memory will be the same as if you had studied one topic at a time.

a