Where did italian immigrants settle in the united states?

Over a third of Italian immigrants never went farther west than New York City. Many Italian immigrants settled in Brooklyn, the Bronx, and Manhattan, especially on and around Mulberry Street. Some settled in New Jersey.  

beaches, climate, and waters

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.