Chapter 2 - Acute Angles and Right Triangles - Section 2.5 Further Applications of Right Triangles - 2.5 Exercises - Page 86: 9

$I$

Here, a single angle ($180^{\circ}$) is given. Therefore, we should understand that bearing is measured from due north in a clockwise direction. In graph $I$, $180^{\circ}$ from due north in the clockwise direction is marked. Therefore, it is the appropriate one.