Iam a process and strive to purge impurities. my goal is to achieve immortality. i am best known for attempting to alter pb#82 to au#79. what am i?me i need to get this right. i will give max points to whoever can get !

I would say that it sounds like you are an alchemist as during the 1500's at least they tried to turn base metals like Pb or lead into Au or gold. While this is not possible, their experiments gave rise to the science and techniques of metallurgy and assaying as confirmed by the great first mine geologist, Georgius Agricola in the 1500's,

Ithink the answer is pollution in the air steel made of iron and carbon

The answer for this question is d. none of these