This ethnic group spread across Africa as ancient tribes migrated more than 4,000 years ago, and today is often considered a language group.

Bantu

Explanation:

the navigation act prevented the colonies from exporting to countries other than britain and it prevented the importation of goods by other countries as well. so i believe the correct answer is d. other nations could not deliver goods to the colonies.

hope this .

your answer will be b. improving roads, bridges, and other infrastructure. hope i !