Nitrogen-Fixing Bacteria in the Roots of Soybeans Help Provide a Source

Multiple Choice

Nitrogen-fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants,and in exchange,the bacteria obtain food from the plants.Which reaction can these bacteria catalyze?

A) nitrogen gas (N₂) to nitrate (NO₃)
B) ammonium (NH₄⁺) to nitrate (NO₃)
C) nitrogen gas (N₂) to ammonium (NH₄⁺)
D) nitrate (NO₃) to ammonium (NH₄⁺)
E) nitrate (NO₃) to nitrogen gas (N₂)