Consider a Uniform Electric Field E= 5

Consider a uniform electric field E= 5.0 kN/C) parallel to the +x axis. What is the flux of this field through a square of side 20 cm if the normal to its plane makes a 45º angle with the x-axis?

A) 71 N · m²/C
B) 0.14 kN · m²/C
C) 0.28 kN · m²/C
D) 0.35 kN · m²/C
E) 0.19 kN · m²/C