$\mathop {\lim }\limits_{x \to \infty } {\left( {\frac{{x + 3}}{{x + 1}}} \right)^{x + 1}} = $

  • A
    $e^2$
  • B
    $e^3$
  • C
    $e$
  • D
    $e^{-1}$

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