The number of valence electrons in an atom with electronic configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}$ is

• A

  $2$
• B

  $3$
• Correct answer
  C

  $5$
• D

  $11$

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