Which of the Following Shows the Correct and Complete Flow $\rarr$

Multiple Choice

Which of the following shows the correct and complete flow of electrons for ribonucleotide reductase?

A) NADH $\rarr$ FAD $\rarr$ thioredoxin $\rarr$ ribonucleotide reductase
B) NADPH $\rarr$ glutathione $\rarr$ glutaredoxin $\rarr$ ribonucleotide reductase
C) NADPH $\rarr$ thioredoxin $\rarr$ cytochrome-b $\rarr$ ribonucleotide reductase
D) FADH₂ $\rarr$ glutathione $\rarr$ glutaredoxin $\rarr$ ribonucleotide reductase
E) none of the above