What Is Leghemoglobin, Which Contains an Iron-Containing Heme Group, Used

Multiple Choice

What is leghemoglobin, which contains an iron-containing heme group, used for?

A) to remove O₂ from roots
B) to produce H₂O from O₂
C) to deliver O₂ to bacteroids
D) to transport O₂ in the xylem