Angles between South & West and South & East are
B
vertically opposite angles
D
adjacent but not supplementary
Correct option is C. making a linear pair
We have,
Angle between South and West $$=90^o$$
Angle between South and East $$=90^o$$
Sum of the angles $$=180^o$$
$$\therefore$$ The angles between South and West and South and East are making a linear pair.
Hence, option (C) is correct.