You will be given a definition of a task first, then some input of the task.
You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.

Paragraph- Sent 1: Porky is looking all over the big city for a hotel room , but due to a convention there are no vacancies .
Sent 2: Porky takes the only available vacancy at one hotel , but will have to share with Daffy Duck , who is a very loud , obnoxious and annoying sort .
Sent 3: Daffy introduces his invisible kangaroo friend `` Hymie '' , but Porky wo n't believe that .
Sent 4: Daffy spends the rest of the night annoying Porky : pestering him with questions , shaking the bed , spilling water from a glass , hogging the blanket and finally literally sending the both of them flying off the bed when Daffy kicks , and startles , Porky with his literally frozen feet .
Sent 5: Fed up with his antics , Porky stuffs Daffy in a pillow case and drops him out of the window .
Sent 6: As Porky goes back to bed , Daffy returns bandaged , but shakes them off and prepares to get revenge .
Sent 7: Daffy tricks the half-asleep pig into stepping out of a window thinking he 's boarding a train .
Sent 8: Daffy hides the window saying it 's `` too gruesome '' to watch .
Sent 9: Suddenly he hears train noises , and behind the shade , sees the still-drowsy Porky pulling away on an actual train and waving at Daffy .
Sent 10: Daffy finds this silly .
Sent 11: Then he bounces all around the room , `` Hoo-Hoo ! ''Sent 12: - ing wildly . 
Question: Why is Porky having some difficulty with getting a room? (A) Rooms are too expensive (B) There is a large convention being held in the city (C) He does not have any money (D) A game (E) Duck migration (F) An event (G) There are no vacancies (H) A convention (I) A convention in town.
Output:
B, F, G, H, I.