Two Point Charges Of $+ 5.00 \mu \mathrm { C }$

Two point charges of $+ 5.00 \mu \mathrm { C }$ and $+ 8.00 \mu \mathrm { C }$ are placed inside a cube having sides $0.100 \mathrm {~m}$ long. What is the net electric flux passing through the surface of the cube? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \right.$ . $\mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 }$ )
A) $0.450 \times 10 ^ { 6 } \mathrm { Nm } ^ { 2 } / \mathrm { C }$
B) $1.47 \times 10^6 \mathrm { Nm } ^ { 2 } / \mathrm { C }$
C) $3.80 \times 10^6 \mathrm { Nm } ^ { 2 } / \mathrm { C }$
D) $4.20 \times 10 ^ { 6 } \mathrm { Nm } ^ { 2 } / \mathrm { C }$
E) $0.340 \times 10 ^ { 6 } \mathrm { Nm } ^ { 2 } / \mathrm { C }$