Which of the following accurately describes condemnation by right of eminent domain?

(a) It involves the redistribution of property first owned by the government to private businesses.
(b) It was never exercised for such private purposes as acquiring land for canal or railroad construction during the antebellum period.
(c) The benefits can be diverse and the costs can be concentrated.
(d) It was never exercised by the federal government before the 1870s.