An Ideal Air-Filled Parallel Plate Capacitor with Plate a Separation $4.0 \mathrm {~cm}$

An ideal air-filled parallel plate capacitor with plate a separation of $4.0 \mathrm {~cm}$ has a plate area of $0.040$ $\mathrm { m } ^ { 2 }$ . What is the capacitance of this capacitor with air between these plates? $\left( \varepsilon _ { 0 } = 8.85 \times 10 ^ { - 12 } \right.$ $\mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 }$ )

A) $89 \mathrm { pF }$
B) $0.89 \mathrm { pF }$
C) $8.9 \mathrm { pF }$
D) $8.9 \mu \mathrm { F }$
E) $8.9 \mathrm { nF }$