Because the orbital period and rotational period are the exact same.
Angles in a triangle add to 180 so
55 + 23 = 78 so 180 - 78 = 102 so the other angle in the triangle would be 102 degrees
The answer is the Coast of Somali
Does the map scale have distances on it or is it a different scale.
It most likely shows distances so I would go with C.
Im not sure but probably.