Which of the following correctly defines the Avogadro constant?

Let's analyze each option to determine which one correctly defines the Avogadro constant. The Avogadro constant ($N_A$) is defined as the number of constituent particles (atoms, molecules, ions, etc.) in one mole of a substance. Its value is approximately $6.022 \times 10^{23} \text{ mol}^{-1}$.

We are given the atomic masses: C=12, O=16, He=4, Na=23.

Step 1: Evaluate option A.
A: The number of carbon atoms in $1 \text{ g}$ of carbon.
The molar mass of carbon (C) is $12 \text{ g/mol}$.
Number of moles of carbon in $1