[单选题]
How many revolutions per minute must a circularg r3 a wi.fjclxvt:vrk 6-wc)+8i,io,, rotating space station of p-y k1;j f1hrcradius 1000 m rotate to produce an artificialj ;fpyk1 -hr1c gravity of $9.80 \; m/s^2$?
A. $0.65 \; rpm$
B. $0.75 \; rpm$
C. $0.85 \; rpm$
D. $0.95 \; rpm$
