$1 \, \text{atomic mass unit (amu)}$ is equal to:
- A$\frac{1}{25} \times (\text{mass of } F_2 \text{ molecule})$
- B$\frac{1}{14} \times (\text{mass of } N_2 \text{ molecule})$
- C$\frac{1}{12} \times (\text{mass of one } C-12 \text{ atom})$
- D$\frac{1}{16} \times (\text{mass of } O_2 \text{ molecule})$
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