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Read the following sentence from paragraph 9.

"[9] A material invented by Argonide Corporation, however, made up of positively charged microscopic alumina fibers, can remove virtually all contaminants, including bacteria and viruses, despite having significantly larger pores—allowing a much higher flow rate."

What is the meaning of "contaminants" as it is used in the sentence?

A. polluting substances
B. activated carbons
C. large alumina fibers
D. negative charges