Two newspapers $A$ and $B$ are published in a city. It is known that $25\%$ of the city population reads $A$ and $20\%$ reads $B$ while $8\%$ reads both $A$ and $B.$ Further, $30\%$ of those who read $A$ but not $B$ look into advertisements and $40\%$ of those who read $B$ but not $A$ also look into advertisements, while $50\mathbf{\%}$ of those who read both $A$ and $B$ look into advertisements. Then the percentage of the population who look into advertisements is:

• A

  $13.5$
• B

  $12.8$
• Correct answer
  C

  $13.9$
• D

  $13$

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