What percent of energy is transferred from the sun to the level indicated?
Select one:
a. 50 percent
b. 100 percent
c. 90 percent
d. 10 percent
I believe the answer is "D". Please correct me.

D) 10 percent

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.