The equation for density is mass over volume, because density is basically a measurement of the amount of mass in a certain volume (the amount of element-stuff squished into a certain three-dimensional space). So, to find the density:
[tex]density=\frac{mass}{volume}\\density=\frac{14.4\ g}{5.74\ cm^3}\\density=2.5087\ g/cm^3[/tex]
So, the answer is B) 2.51 g/cm3,