Lead.
"Due to insufficient water treatment, lead leached from water pipes into the drinking water, exposing over 100,000 residents to elevated lead levels."
Explanation:
They are useful as they can predict the genetic probability of a particular phenotype arising in a couple's offspring. In other words, it can tell you if you will or will not have a certain trait.
I'd say probably Biomass, not 100% sure but it's renewable, but it can create power and heat.
The answer is C, since antibiotics will not effect viruses, only bacterial infections.
