Which of the following is the smallest unit?

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(C) To determine the smallest unit, we compare their values in terms of metres:$1 	ext{ Millimetre } (mm) = 10^{-3} \, m$$1 	ext{ } \mathring{A} (\m

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(C) To determine the smallest unit, we compare their values in terms of metres:$1 	ext{ Millimetre } (mm) = 10^{-3} \, m$$1 	ext{ } \mathring{A} (\mathring{A}) = 10^{-10} \, m$$1 	ext{ Fermi } (fm) = 10^{-15} \, m$$1 	ext{ Metre } (m) = 1 \, m$Comparing these values, $10^{-15} The correct option is $C$.

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