$A$ bar of iron having magnetic moment $2.4 \text{ Am}^2$ weighs $66 \text{ g}$. If the density of the material of the bar is $7700 \text{ kg/m}^3$,the intensity of magnetisation in $\text{Am}^{-1}$ is
- A$1.4 \times 10^5$
- B$2.8 \times 10^5$
- C$1.4 \times 10^4$
- D$2.8 \times 10^4$
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