Convert $1$ $g/c{m}^3$ to $kg/m^3$

The correct option is A 1000
We know that $1g=\frac{1}{1000}kg$
Also, $1cm=\frac{1}{100}m$
Thus $1g/c{m}^3=1g\times \frac{1kg}{1000g}\times \frac{1}{1c{m}^3}\times \frac{(100{)}^{3}c{m}^3}{1m^3}=1000kg/m^3$