Lost generation is most likely referring to the young men that served in the military and lost their lives during the war, which left a huge age gap in many populations. The remaining population mostly consisted of women and men that were too old to serve or too young. All fit men between the ages of 18-45 ish were gone.
A. Synthesize, if he is compiling multiple sources together.
I think it's the 3rd one. Might be wrong though.
The closest meaning to the word congested as it’s used in this means when someone can’t breath because the this she nose becomes swollen that’s why is also called stuffy nose.