A parallel plate capacitor has two square plates of side length d$,$ separated by distance b$.$ The capacitance is C$0.$ What would the capacitance of a similar capacitor be if the side length were increased to $2$d and the distance were increased to $2$b$?$ A$)8$C$0$ B$)2$C$0$ C$)$ C$0/2$ D$)$ C$0/$