If $\beta + 2 \int\limits_0^1 {{x^2}\,{e^{ - {x^2}}}}\, dx = \int\limits_0^1 {{e^{ - {x^2}}}}\, dx$,then the value of $\beta$ is

  • A
    $e^{-1}$
  • B
    $e$
  • C
    $1/(2e)$
  • D
    Cannot be determined

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