[单选题]
A uniform rod of mas4 hz sjvf,r+3-zw8s(kpl m;d k.lw.e8 .f4 hpf +gv7np r1krges M and length L is pivoted at one of its ends. The rod is released from rest from the horizontal posif8np.r pke. f 4evlr.hwgg1 7+tion.
The moment of inertia of the rod when rotating about its end is $\frac{1}{2}ML^2$.
What is the linear speed of the bottom end of the rod as it swings past the vertical position?
A. $\sqrt{\frac{3g}{L}}$
B. $\sqrt{3gL}$
C. $\sqrt{6gL}$
D. $\frac{3g}{2L}$
