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.
The unlikely story he told proved to be a cunning ploy at deception.
I believe there are three correct answers here, and those are B, C, and E.
The topic sentence has to do with good nutrition and healthy habits which are supposed to make the world a better place in the author's personal utopia (perfect society). In order to do that, people would need to be provided with healthy and cheap food, they would need to exercise more, and have plenty of sleep in order to improve their day-to-day lives.
If you are referring to a girl getting pregnant or a couple having sex than in some cases a unexpected pregnacy can thrust the pressure of marriage upon minors. But way less today than in the past.
