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

  • A
    $1$
  • B
    $3$
  • C
    $6$
  • D
    $\frac{2}{3}$

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