1) compare owners to owners only (C),(E) do that.C appears much better of the two.
2)(A) - active so (B) (C),(E) would be out.(D) says as if they were not correct.
3)during has to be used for a period say for the last two decades.Cannot be used directly as in during two decades.
A well-balanced person is one who has a drink in each of his hands.