Consider the charge configuration and spherical Gaussian surface as shown in the figure. When calculating the flux of the electric field over the spherical surface, the electric field will be due to

• A

  ${\mathrm{q}}_2$

• B

  only the positive charges

• C

  all the charges

• D

  $+{\mathrm{q}}_1\mathrm{and}-{\mathrm{q}}_1$