For the equation $2x^2 - 2(m^2 + 1)x + m^4 + m^2 + 1 = 0$,if $\alpha$ and $\beta$ are the roots,then $\alpha^2 + \beta^2 = \dots$

  • A
    $0$
  • B
    $1$
  • C
    $m$
  • D
    $m^2$

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