Explanation:
In the given question, the options of the given question have not been provided but based on previous knowledge about the question, the question can be answered.
The cow during the 1900's produced about 424 gallons of milk every year but the filed of eugenics opened the way for higher production of milk. The aim was to produce more milk at cheaper rate therefore efforts were made to perform breeding experiments with desired traits.
In the present condition, the production of milk has increased from 424 gallons to 2000 gallons due to breeding, higher literacy rate of the Americans and the stable financial system of the states.
Thus, breeding, literacy rate and the stable financial system are the possible ways.
