$\int_0^{\pi / 4} \frac{\sec x}{3 \cos x+4 \sin x} d x=$

• A

  $\log \left(\frac{7}{3}\right)$
• Correct answer
  B

  $\frac{1}{4} \log \left(\frac{7}{3}\right)$
• C

  $\frac{1}{4} \log 7$
• D

  log 7

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