Which frequency range is suitable for sky wave propagation?

  • A
    $1 \text{ kHz}$ to $500 \text{ kHz}$
  • B
    $2 \text{ MHz}$ to $20 \text{ MHz}$
  • C
    $2 \text{ MHz}$ to $2 \text{ GHz}$
  • D
    Above $30 \text{ MHz}$

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