The strategy for bioremediation of large sites contaminated by inorganic pollutants like toxic metals and radionuclides is usually to

The answer in the space provided is contains the pollutants in a process of having to convert it with less mobile form as this is the strategy used that is helpful for bioremediation in terms of large sites in which is contaminated with the inorganic pollutants.

looks like the answer is     c     to me!