The energy of the $K_\alpha$ $X$-ray line of an element is $8578$ units,and the energy of the $L$ level is $-2859$ units. The energy of the $K$ level is . . . . . . units.

  • A
    $-5719$
  • B
    $5719$
  • C
    $11437$
  • D
    $-11437$

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