The question asks for the shortest route from D to B.

Option 1: This route involves traveling from D to A and then from A to B. This involves two straight movements.

Option 2: This route involves traveling from D to E and then from E to B. This is similar to option 1, it involves two different directions to reach the point B.

Option 3: This route involves traveling from D to C and then from C to B. Again, it has two different direction movements which can be seen as similar to option 1 and 2.

Option 4: This route involves traveling from D to F and then from F to B. Although the question lacks a visual representation of this journey, the answer suggests that F is on the perpendicular line between D and B. Hence, this route is the most direct and would be the shortest.

Remember, the shortest distance between two points is a straight line, and options 1, 2, and 3 involve zigzag or roundabout routes as compared to option 4.