The atomic weight of a radioactive element is $M_w \, g/mol$. The radioactivity of $m \, g$ of its mass is: ($N_A =$ Avogadro number,$\lambda =$ decay constant)
- A$N_A \lambda$
- B$\left( \frac{N_A}{M_w} m \right) \lambda$
- C$\left( \frac{N_A}{m} \right) \lambda$
- D$\left( \frac{N_A}{m} M_w \right) \lambda$
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