If $a \sin^2 x + b \cos^2 x = c$,$b \sin^2 y + a \cos^2 y = d$ and $a \tan x = b \tan y$,then $\frac{a^2}{b^2}$ is equal to

  • A
    $\frac{(b - c)(d - b)}{(a - d)(c - a)}$
  • B
    $\frac{(a - d)(c - a)}{(b - c)(d - b)}$
  • C
    $\frac{(d - a)(c - a)}{(b - c)(d - b)}$
  • D
    $\frac{(b - c)(b - d)}{(a - c)(a - d)}$

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