Which of the Following Statements About Polyploidy in Plants Is

Which of the following statements about polyploidy in plants is correct?

A) Polyploidy is rare in plants.
B) Allopolyploids are hybrid plants that result from the mating of two closely related species.
C) Tetraploid plants can mate with other tetraploid plants of the same species, but not with themselves.
D) Tetraploid and diploid plants of a given species can mate to produce viable triploid offspring.
E) Polyploid plants are usually less vigorous than diploid plants of the same species.