[单选题]
2. There are many difd /t ithf2,a/wferent domesticated breeds of cattle descended me15ht4 avmweh 4x 7*afrom the wild ox about 10,500 years ago. What is the term that describesme7he*5v1a mh x44t aw the formation of new breeds of farmed cattle?
A. Inbreeding.
B. Selective breeding.
C. Natural selection.
D. Speciation.
