Transnational communities encounter many unique challenges in terms of migration. Describe some of these challenges and how they are bound up in broader questions surrounding immigration policies.
Your response should be a paragraph in length.

answer; (b); i believe its indefinite existence of human population in a healthy and prosperous condition;

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.