B. Until the invention of barbed wire, most stock fences in Texas were actually living hedges, the osage orange bush being the most popular.
<span>An army attacks from the flank because they could be coming from a more advantageous position. Also attacking at the flank hits them where they are not prepared, since they are marching to fight head on.</span>
Your answer is 3, the Great Dividing Range
If you look at the photo attached, the Great Dividing Range is on the right, much like the map you provided.
Hope this helps :)