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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