Iron exhibits bcc structure at room temperature. Above 900 C , it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900 C (assuming molar mass and atomic radii of iron remains constant with temperature) is

1. A. 3 3 4 2
2. B. 4 3 3 2
3. C. 3 2
4. D. 1 2

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