A mass $M$ is suspended from a spring of negligible mass. The spring is pulled a little and then released so that the mass executes simple harmonic oscillations with a time period $T$. If the mass is increased by m then the time period becomes $\left( {\frac{5}{4}T} \right)$. The ratio of $\frac{m}{{M}}$ is
  • A$ \frac{9}{16}$
  • B$ \frac{25}{16}$
  • C$ \frac{4}{5}$
  • D$ \frac{5}{4}$
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