It's B : The strong wind knocked down the tent; we'll have to get it up again.
A and D are run-on sentences.
C is also a run-on sentence, yet is has a comma.
If they didn't exist there would be chaos.
You would be dead.
I would be dead.
Everyone killing them selves.
It's gonna be like the purge, people stealing, people killing.
There would be no laws, rules or regulations regarding the environment. Crimes would be committed, and there would be no punishment or rehabilitation.
Is there a book that goes with it because that’s just a picture and could mean anything