Some plants can use ammonia as a nitrogen source, but most prefer nitrates (NO₃⁻). Please select the correct order of steps bacteria use that cause nitrogen gas to become nitrate and end up in plants.
a. Assimilation → Nituification → Nitrogen Foxation
b. Nitrogen Fixation → Nitrification → Assimitation
c. Assimilation → Ammonificaton → Nituification
d. Ammanification → Denituification → Assimilation