I’m behind on 3 assignments and I need help <3

Africa's land was exploited by countries such as England of their minerals like gold due to colonialism. This left the countries poor and without anything to trade in the future.

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.