Answer: i think its C. but find another source just in case.
Answer:
Iron -> Fe - Group 8
Silver -> Ag - Group 11
Mercury -> Hg - Group 12
Oxygen -> O - Group 16
Gold -> Au - Group 11
Potassium -> K - Group 1
Xenon -> Xe - Group 18
Magnesium -> Mg - Group 2
Hydrogen -> H - Group 1
Well, the asthenosphere is located in the upper mantle. So that is how they are related.
E.coli because e coli is a bacteria.