Correct Answer: Option B

Explanation

Fraction remaining  = (\(\frac{1}{2}\))\(^{\frac{t}{T_{\frac{1}{2}}}}\)

BUT \(\frac{t}{T_{\frac{1}{2}}}\) = \(\frac{80}{20}\) = 4

Fraction remaining = (\(\frac{1}{2})^4\) = \(\frac{1}{16}\)

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