How has the herd size of cattle been successfully increased?
ABreeding normal cows
BBreeding diseased cows
CBreeding high milk-yielding bulls
DBreeding high-quality meat-yielding bulls
ABreeding normal cows
BBreeding diseased cows
CBreeding high milk-yielding bulls
DBreeding high-quality meat-yielding bulls
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In the following diagram, what does the question mark represent?