What are the oxidation numbers of hydrogen in $KH$,$MgH_2$,and $NaH$ respectively?

  • A
    $+2, +1$ and $-2$
  • B
    $+1, +1$ and $+1$
  • C
    $-1, -1$ and $-1$
  • D
    $-2, -3$ and $-1$

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