यदि $x$ के सभी वास्तविक मानों के लिए,$\frac{4x^2 + 1}{64x^2 - 96x \sin \alpha + 5} < \frac{1}{32}$ है,तो $\alpha$ किस अंतराल में स्थित है?

  • A
    $(0, \pi/3)$
  • B
    $(\pi/3, 2\pi/3)$
  • C
    $(4\pi/3, 5\pi/3)$
  • D
    $b$ या $c$ दोनों

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