The process of conversion of soil nitrates into free `N_(2)` is called (I) and is carried out by bacteria (II).
A. `{:("(I)","(II)"),("nitrification","Nitrosomonas"):}`
B. `{:("(I)","(II)"),("denitrification","Nitrobacter"):}`
C. `{:("(I)","(II)"),("denitrification","Thiobacillus"):}`
D. `{:("(I)","(II)"),(" "N_(2)" fixation","Nitrosomonas"):}`
