It can be inferred from the author's discussion of Pseudomonas fluorescens bacteria that which one of the following would be true of crops impervious to parasitical organisms? A. Pseudomonas fluorescens bacteria would be absent from the soil surrounding their roots. B. They would crowd out and eventually exclude other crop plants if their growth were not carefully regulated. C. Their yield would not be likely to be improved by adding Pseudomonas fluorescens bacteria to the soil. D. They would mature more quickly than crop plants that were susceptible to parasitical organisms. E. Levels of phytopathogenic bacteria in the soil surrounding their roots would be higher compared with other crop plants.