Find all pairs of consecutive odd natural numbers,both of which are larger than $10$,such that their sum is less than $40$.

  • A
    $(11, 13), (13, 15), (15, 17), (17, 19)$
  • B
    $(11, 13), (13, 15), (15, 17), (17, 19), (19, 21)$
  • C
    $(9, 11), (11, 13), (13, 15), (15, 17)$
  • D
    $(13, 15), (15, 17), (17, 19), (19, 21)$

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