$\int \frac{3^x(x \log 3-1)}{x^2} d x=$

• A

  $x .3^x+c$
• B

  $\frac{3^x}{x^2}+c$
• C

  $x^2 3^x+\mathrm{c}$
• Correct answer
  D

  $\frac{3^x}{x}+c$

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