8) In the rectangle $A B C D$ (vertices indicated in a counterclockwise direction), $E$ and $F$ are the midpoints of the longer sides $A D$ and $B C$ respectively. Knowing that $A B F E$ is similar to $A B C D$, what is the value of $A D / A B$?
(A) $\frac{7}{5}$
(B) $\frac{3}{2}$
(C) $\sqrt{3}$
(D) $2 \sqrt{2}$
(E) the above answers are all incorrect.
8) The answer is $(\mathbf{E})$.

From the similarity between $A B C D$ and $A B F E$, we get $\frac{A D}{A B}=\frac{A B}{A E}=\frac{A B}{\frac{A D}{2}}=2 \frac{A B}{A D}$, from which $\left(\frac{A D}{A B}\right)^{2}=2$ and thus $\frac{A D}{A B}=\sqrt{2}$.