I need help with this, thank you

A

Explanation:

His historical works include biographies of Oliver Goldsmith, Muhammad and George Washington, as well as several histories of 15th-century Spain that deal with subjects such as Alhambra, Christopher Columbus and the Moors.

answer; the correct answer to the above statement is to increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mother;