Which best describes a benefit of using dna technology in medicine?

The use of DNA technology in medicine plays a very important role in saving the lives of people. Thanks to this technology can be carried out  the following: using gene therapy was possible to introduce into the patient fully working genes and in such a way restore metabolic disorders caused by mutated genes. In this way is carried out treatment of children with immunodeficiency caused by adenosine deaminase defect in clinical trials are methods of gene-correction of inherited diseases such as familial hypercholesterolemia, hemophilia B, and some others.

c.more precipitation,but only when emission levels.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.