[单选题]
Planet X has half the mass and;n rix 1 ;( xku2uhhgl(5 uf,rnj):penibo b;: twice the diameter of planey3dabt6l40*c cwelr bob2;8 c t Y. The escape speed from the surface of planet X is given by v. Wh0edbr4oa cylb26 3ctb l 8c;*wat is the escape speed from the surface of planet Y ?
A. $\frac{v}{2}$
B. $\frac{v}{\sqrt{2}}$
C. $v\sqrt{2}$
D. 2v
