PLEASE HELP I WILL GIVE BRAINLIST! Question and answer choices and pic

As a small change in a person's dna can cause a genetic disorder

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.

I’m stuck on this question cuz i’m stupid sksksksk