; or (B) in the event that adjacent seat assignments are not available as described in subparagraph (A), an accompanying adult the choice of— (i) a full refund of the cost of the tickets for the young child and the accompanying adult, as well as any other individual on the same reservation; or (ii) waiting for adjacent seat assignments to be provided by the carrier. (2) Required option period The air carrier or foreign air carrier shall provide the accompanying adult a period of not less than 7 days from the date of notification of the choice described in paragraph (1)(B) to make a selection between the options described in clauses (i) and (ii) of such paragraph. (3) No available adjacent seat assignment In the event that an accompanying adult chooses the option described in paragraph (1)(B)(ii) and adjacent seat assignments for the young child and the accompanying adult on a ticketed flight segment do not become available before the first passenger boards the flight, the air carrier or foreign air carrier shall, at the choice of an accompanying adult— (A) rebook the young child and the accompanying adult, as well as any other individual on the same reservation, on the next available flight at no additional cost; or (B) transport the young child and the accompanying adult on their original ticketed flight segment in seats that are not adjacent, when seats on the aircraft are available. (d) Additional requirements To mitigate passenger harm in event of violation An air carrier or foreign air carrier that violates subsection (b) or (c) shall, at the choice of an accompanying adult— (1) rebook the young child and the accompanying adult, as well as any other individual on the same reservation, on the next available flight at no additional cost; (2) provide— (A) a full refund of the cost of the tickets for the young child and the accompanying adult, as well as any other individual on the same reservation