$2 \text{ g}$ of a radioactive sample having a half-life of $15$ days was synthesized on $1^{st}$ Jan $2009$. The amount of the sample left behind on $1^{st}$ March $2009$ (including both the days) is: (in $\text{ g}$)

  • A
    $0$
  • B
    $0.125$
  • C
    $1$
  • D
    $0.5$

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