The correct answer is B. Selective breeding.
Selective breeding has led to most modern domesticated livestock and crops.
Selective breeding is termed as the process by which human being use plant breeding and animal breeding to selectively develop a certain phenotypic traits.
Animals breeding like outcrossing, linebreeding, and inbreeding are being utilized the same way applies to plant breeding.
Selective breeding can result from process of human cultivation and can produce undesirable results.