The conservation tactic that can decrease the amount of pollution entering the air when coal is burn is installing scrubbers in power plants.
<em><u>Coal-burning power plants are the largest source of sulfur dioxide, a pollutant gas that contributes to the production of acid rain and causes remarkable health problems. </u></em>
<em><u>Scrubbers are apparatus that clean the gases passing through the smokestack of a coal-burning power plant.</u></em>
<em><u>They are installed to reduce sulfur dioxide (SO2) emissions from the coal-burning process.scrubbers are installed to reduce sulfur dioxide (SO2) emissions from the coal-burning process.</u></em>
The lac repressor prevents the lac genes in the DNA of E. coli from being expressed most of the time. The answer to your question is A. I hope this is the answer that you are looking for and it comes to your help.