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.
I think it's D, the others either don't have enough punctuation or they have too much
Answer:
Here's the answer to the best of my ability..
You're asking for what sentence is missing a hyphen and I see nothing wrong with the one sentence that doesn't have a hyphen.
But if you're asking for what sentence is using a hyphen incorrectly then option B is your answer because machine gun doesn't need a hyphen.
If you're asking which sentences are using the hyphen correctly then option's A, and C are your answer.
If you're the question you asked has no mistakes then the best answer would be option D because that's the only option without a hyphen.
Hope this helps.
Patients would tell Earhart stories about flying planes in WW1, and this encouraged her to take lessons and buy her own plane.