Examine the Structures of the Following Compounds

Examine the structures of the following compounds. Each structure shows the biologically operative part of a biomolecule. Which of the following statements is not a common characteristic of both compounds?

A) Both require two electrons for reduction.
B) Both require two hydrogen ions for reduction.
C) Both compounds produce electron-transporting molecules on reduction.
D) Both are classified as coenzymes.
E) All of these statements are common characteristics of both compounds.