A man standing at 30^{\circ} latitude fires a bullet northward at a speed of 200 \mathrm{~m} / \mathrm{s}. The radius of the Earth is 6371 \mathrm{~km}. What is the sideway deflection of the bullet after traveling 100 \mathrm{~m} ?
Answer Choices
A. 3.1 \mathrm{~mm} west
B. 1.8 \mathrm{~mm} west
C. 0 \mathrm{~mm}
D. 1.8 \mathrm{~mm} east
E. 3.1 \mathrm{~mm} east