A Block of Iron Has a Mass of 826 G $\circ$

Multiple Choice

A block of iron has a mass of 826 g. What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25 ^$\circ$ C are provided: magnesium, 1.7 g/cm³ ; graphite, 1.8 g/cm³ ; iron, 7.9 g/cm³.

A) 1,400 g
B) 3,800 g
C) 830 g
D) 180 g
E) none of them are within 10 g of the right answer.