Ans: D
Note that $CF=DE$. Therefore, the angle of inclination varies inversely as the horizontal distance.
Note that $CF=DE$. Therefore, the angle of inclination varies inversely as the horizontal distance.
$\begin{array}{rl}
\because & BF = AE < HF < GE \\
\therefore & a = b > c > d
\end{array}$
Hence, the answer is $d < c < b$.
