If you cannot recall what you have just read, it is most likely because:

Question

A. you did not ask questions while reading.
B. You were passively reading.
C. The information was too difficult to fully understand.
D. Both A & C.
i got B what do you think?

Answer 1

I agree. :-)

Answer 2

B is probably the best answer. But I remember the first time I read Albert Einstein's book for High Schoolers on Relativity, C was the answer then. It took me 4 years to understand it.
Hardheaded I am.

Answer 3

haha bob my book is'nt albert einstein's book my book is introduction to highschool :)