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According to the passage, the ultimate goal of the current research on nitrogen fixation is to develop
  • Astrains of Rhizobium that can enter into symbioses with existing varieties of wheat, rice, and other nonlegnumes
  • Bstrains of Rhizobium that produce more ammonia for leguminous host plants than do any of the strains presently known
  • Cvarieties of wheat, rice, and other nonlegumes that yield as much as do existing varieties, but require less nitrogen
  • Darieties of wheat, rice, and other nonlegumes that maintain an adequate symbiotic relationship with nitrogen-fixing bacteria and produce high yields
  • Ehigh-yielding varieties of wheat, rice, and other nonlegumes that are genetically equipped to fix nitrogen from the air without the aid of bacteria

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