[单选题]
Two masses M and m are connected by a rod of yg)6. d shdf**fq+naknegligible mass. They rotate a6-00n:xannt i mzqranjb7 10 rround a vermb0tr 0 ni-xn1a06ra7:jn znqtical axis as shown in the diagram.
The ratio
$frac{Distance between M and the axis}{Distance between m and the axis}$=$frac{1}{2}$
What is the moment of inertia?
A. $frac{L^2(M+m)}{4}$
B. $frac{L^2(M+m)}{9}$
C. ${L^2(M+m)}$
D. ${L^2(M+4m)}$
