Time for 99.9% completion of a first order reaction from the time for 90% completion

1. A.
   $x$ minute
2. B.
   $2x$ minute
3. C.
   $3x$ minute
4. D.
   $\frac{x}{2}$ minute

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1. A.
   $2$ hours.
2. B.
   $1$ hour.
3. C.
   $3$ hours.
4. D.
   $0.5$ hour.

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1. A.
   $3t$
2. B.
   $2t$
3. C.
   $t$
4. D.
   $\dfrac{3t}{2}$

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