NEET 2005 Biology question

All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia :

• (A)can induce root nodules on many plant species
• (B)can fix nitrogen in the free-living stateCorrect
• (C)like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex
• (D)forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids