(C) The number of neutrons is calculated as $N = A - Z$,where $A$ is the mass number and $Z$ is the atomic number.For carbon $(_{6}^{12}C)$: $N = 12 -

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(C) The number of neutrons is calculated as $N = A - Z$,where $A$ is the mass number and $Z$ is the atomic number.For carbon $(_{6}^{12}C)$: $N = 12 - 6 = 6$.For silicon $(_{14}^{28}Si)$: $N = 28 - 14 = 14$.The ratio of neutrons in $C$ to $Si$ is $6 : 14$,which simplifies to $3 : 7$.