"The Science of Improving Stock,which…takes Cognizance of All Influences That

"The science of improving stock,which…takes cognizance of all influences that tend in however remote a degree to give the more suitable races or strains of blood a better chance of prevailing speedily over the less suitable than they otherwise would have had," is a definition of the doctrine of:

A) Eugenics.
B) evolution by natural selection.
C) Social Darwinism.
D) evolution by artificial selection.