If $\frac{x^2}{a}+\frac{2 x y}{h}+\frac{y^2}{b}=0$ represents a pair of straight lines such that the slope of one of the lines is twice the other, then $\frac{a b}{h^2}=$

• Correct answer
  A

  $\frac{9}{8}$
• B

  $\frac{8}{9}$
• C

  $\frac{2 \sqrt{2}}{3}$
• D

  $\frac{3}{2 \sqrt{2}}$

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