Which of the following is NOT correct regarding rhizobia?

A) Rhizobium, Bradyrhizobium, and Synorhizobium are among the genera comprising rhizobia.
B) They may live freely in soil, but they prefer to establish symbioses with specific legumes.
C) They form nodules in the roots to favor anaerobiosis and consequently nitrogen fixation.
D) They provide the host with leghemoglobins, which help the plant hosts combat pathogens.
E) Each species colonizes a particular host range for infection.