It is definitely not B nor D because those two have negative meanings. It can't be C because excessive means "beyond the usual", which has a slightly negative meaning.
The answer should be A, conversational.
When the subject needs to be emphasized more than the action performed,the active voice is used.So (a) is correct
My opinion/answer: I think being a teacher would be better, not only that you can get your own education back up, but you can also get other students education up too! But also being a farmer you can grow your own plants, and food.! But I think teachers would be better.
