Answer:
d.his ability to build a steam-powered textile mill from memory
Explanation:
Samuel Slater when in the UK, he was named "Slater the Traitor" because he brought British textile technology to America, modifying it for United States use. He was able memorize the designs of textile factory machinery as an apprentice to a pioneer in the British industry before resettling to the United States at the age of 21.
Lack of sanitation, People had no concept of how a disease actually worked, so they had no idea that being clean would protect them. Take the leaving of dead bodies in the street for example.