The answers are:
A. It was a time of great prosperity.
D. It stressed the importance of manners.
E. It included established social rules and codes.
F. It emphasized the importance of appearances.
Answer:
The sentence would be casual (informal)
Explanation:
It uses word/phrases that indicate that it is informal, like "flop down" and "shabby little couch." If it were formal there might have been different word choice.
