The period of a simple pendulum, whose bob is a hollow metallic sphere, is $T$.The period is $T_1$ when the bob is filled with sand, $T_2$ when it is filled with mercury and $T_3$ when it is half filled with mercury. Which of the following is true
  • A$T = T_1 = T_2 > T_3$
  • B$T_1 = T_1 = T_3 > T$
  • C$T > T_3 > T_1 = T_2$
  • D$T = T_1 = T_2 < T_3$
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