Answer:
A. They could reduce their use of fossil fuels to decrease the demand for fracking.
C. They could agree to use only fossil fuels from sources other than fracking.
Step-by-step explanation:
Scientists prevent the problem of pollution that occurs through fracking is that they could reduce their use of fossil fuels so in this way decrease the demand for fracking also occur and they could use only fossil fuels from sources other than fracking. These two ways can help to reduce the pollution that occurs due to the process of fracking so we can say that decrease the use of fossil fuel and use of other sources of fossil fuel can reduce this problem.