Q:

 If the (A) obliged are (B) alternative, the (C) authorities are (D) flights to provide compensation or an (E) cancelled.

• 1
  (A) – (E)
• 2
  (B) – (C)
• 3
  (B) – (E)
• 4
  (A) - (D) and (B) and (E)
• 5
  No interchange required