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A body mass m is attached to the lower and of a spring whose upper end is fixed. The spring has neglible mass. When the mass m is slightly pulled down and released, it osocillates with a time period of 3.s When the mass m is increased by 1 kg. the time period of oscillations becomes 5.s The value of m in kg is

(a) $\frac{3}{4}$                (b)$\frac{4}{3}$

(c) $\frac{16}{9}$               (d) $\frac{9}{16}$

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