A Parallel Plate Capacitor Has Plates Each of Area 100 $\mu$

A parallel plate capacitor has plates each of area 100 cm² and with separation 0.25 mm.If this capacitor is charged with 25 pC,what is the average charge density on the positive plate?

A) 400 $\mu$ C/m²
B) 40 $\times$ 10^-12 C/m²
C) 25 pC/m²
D) 2.5 nC/m²
E) 8.8 $\times$ 10^-12 C/m²