The activity of a radioactive sample decreases to $(1/3)$ of its original value in $3\, \text{days}$. Then, in $9\, \text{days}$, its activity will become:
- A$(1/27)$ of the original value
- B$(1/9)$ of the original value
- C$(1/18)$ of the original value
- D$(1/3)$ of the original value
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