The Earth's magnetic field above the Earth's equator is about 10^-4 north. If a proton is intially moving downward at 5*10^5 m/s, it will?

A. curve east, making a circle with r= 50 m.
B. curve west, making a circle with r=50 cm
C. curve east, making a circle with r= 3 cm
D. curve west, making a circle with r= 3 cm

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