$\lim _{x \rightarrow 0} \frac{x^2 \sin ^2(3 x)+\sin ^4(6 x)}{(1-\cos 3 x)^2}=$

• Correct answer
  A

  $\frac{580}{9}$
• B

  $\frac{145}{3}$
• C

  $\frac{580}{3}$
• D

  $\frac{145}{9}$

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