The correct option is C) capable.
As used in line 20, "expert" most nearly means capable.
Dairying, also known as dairy farming, is an agricultural branch that includes a breeding, raising, and use of dairy animals, mainly cows, for the manufacture of milk and the cultured dairy products made from it.
Some key features regarding the dairy farming are-
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The complete question is-
As used in line 20, "expert" most nearly means
line 20: Dairy animals, on the other hand, are expert protein producers, their udders swollen with milk.
A) knowledgeable
B) professional
C) capable
D) trained