Activity falls to a fraction in some days: find the activity after a longer time

1. A.
   $\dfrac{1}{16}$
2. B.
   $\dfrac{1}{32}$
3. C.
   $\dfrac{1}{256}$
4. D.
   $\dfrac{1}{128}$

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1. A.
   $\left(\dfrac{1}{27}\right)$ of the original value
2. B.
   $\left(\dfrac{1}{9}\right)$ of the original value
3. C.
   $\left(\dfrac{1}{18}\right)$ of the original value
4. D.
   $\left(\dfrac{1}{3}\right)$ of the original value

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