[单选题]
Two planets have the sametoot o,pcqc rvb(vg:y))+xe /5w n9 0r surface gravity, but planet B has twice the radix mr 987m.nqx8vro 3n/cxah6gxtq9y: us of q8 x hcx9:6q mnt39. yxn/78r vgraxomplanet A. If planet A has mass m, what is the mass of planet B?
A. $0.707 \; m$
B. $m$
C. $1.414 \; m$
D. $4 \; m$
