Questions 1 37 (Thirty seven questions). Directions: Each of the questions or incomplete statements in this section is followed by four suggested answers. Select the best answer in each case.

Let's determine which option 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 $12 \text{ g/mol}$.
The number of moles of carbon in $1 \text{ g