[单选题]
Two simple pendulums.9d vq4ht86x vl 4 tpilf*.mrj withq2i td6qgm o+p 96teo; lengths $16L$ 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. $\frac{9}{16}T$