Which of the following is not a centripetal force? * O Shared culture
O Nationalism
O Common language
O Mountain range that cuts across the country

I think it's mountain range that cuts across the county

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.