A. Pigs representing soviet leaders were the main characters
The word <em>quickly </em>describes the verb, or the way in which the line is moving. This means that this word is an B. adverb.
A would be - is long, is moving
C would be - long
There are no prepositions here.
If i'm undertsanding correctly... You could use a Thesaurus, the Internet
Having a secret or a hidden message.
Answer:
B. The way the culture and the time in which the author writes
