The technique that injects oxygen and nutrients into a contaminated aquifer to foster the growth of bacteria that can break down contaminant molecules is called choose one: a. buffering. b. reactive barrier injection. c. effluent. d. bioremediation.

The answer for the above question is D. Bioremedation; 
Aquifer is a body of rock or sediment that can hold and release water at an economic cost. Permeability and porosity are generally high, mainly two types, that is confined and unconfined. Confined aquifer is an aquifer bounded above and below aquicludes or aquitards. It is not open to the atmosphere and does not have a fluctuating water table. Unconfined aquifer on the other hand is open to the atmosphere and has water table that flactuates with rainfall.

I’m going to go with b!

Ithink it's c (70)