Question ID:PT31 S3 Q22 Passage:Some types of organisms originated through endosymbiosis, the engulfing of one organism by another so that a part of the former becomes a functioning part of the latter. An unusual nucleomorph, a structure that contains DNA and resembles a cell nucleus, has been discovered within a plant known as a chlorarachniophyte. Two versions of a particular gene have been found in the DNA of this nucleomorph, and one would expect to find only a single version of this gene if the nucleomorph were not the remains of an engulfed organism's nucleus. Stem:Which one of the following is most strongly supported by the information above? Correct Answer Choice:EChoice A:Only organisms of types that originated through endosymbiosis contain nucleomorphs. Choice B:A nucleomorph within the chlorarachniophyte holds all of the genetic material of some other organism. Choice C:Nucleomorphs originated when an organism endosymbiotically engulfed a chlorarachniophyte. Choice D:Two organisms will not undergo endosymbiosis unless at least one of them contains a nucleomorph. Choice E:Chlorarachniophytes emerged as the result of two organisms having undergone endosymbiosis.