Ajay is standing at point A near Pontianak, Indonesia, 0^{\circ} latitude and 110^{\circ} \mathrm{E} longitude. Billy is standing at point B near Big Baldy Mountain, Idaho, USA, 45^{\circ} \mathrm{N} latitude and 115^{\circ} \mathrm{W} longitude. Assume that Earth is a perfect sphere with center C. What is the degree measure of \angle A C B ?
Answer Choices
A. 105
B. 112 \dfrac{1}{2}
C. 120
D. 135
E. 150