[单选题]
Two simple pendulums with 1 0bcppjqx(/vcsk(d/ len l a((o c:fuy t4 +nt;4tiz7x1lzerr7igths $16L$ and $9L$ have masses $4M$ and $3M$ respectively. The period of the mass of $4M$ is $T$. What is the period of mass of $3M$?
A. $\sqrt{\frac{3}{4}T}$
B. $\frac{3}{4}T$
C. $T$
D. $\frac{9}{16}T$