In a region, the electric field is given by $\overrightarrow{\mathrm{E}}=(3 \hat{\mathrm{i}}+5 \hat{\mathrm{j}}+7 \hat{\mathrm{k}}) \mathrm{NC}^{-1}$. The electric flux through a surface of area $3 \mathrm{~m}^2$ in yz plane is (in SI units)

• A

  21
• B

  15
• C

  12
• Correct answer
  D

  9

Hence, the correct answer is option: 'D'.