[A]: Amino acids are converted into ammonia by a group bacteria called ammonifying bac- teria.
[R]: The majority of plants, however, can not utilize ammonium compounds as a source of nitrozen
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false