Final answer:
The Indigenous tribes of America were the group that stretched along the Atlantic Ocean. They were present long before Europeans, consisting of over six hundred tribes, with various cultures and lifestyles. Portuguese and Spaniards were significant in the era of Atlantic exploration and colonization, respectively.
Step-by-step explanation:
The group that stretched for hundreds of miles along the Atlantic Ocean were C) Indigenous tribes of America. These diverse indigenous peoples had established their presence across the vast stretches of North America, including areas along the Atlantic coast, long before European explorers arrived.
They consisted of more than six hundred tribes or groups, with different cultures and subsistence methods, including farming and hunting-gathering, adapted to their environments.
The era of Atlantic exploration was initiated by D) Portugal, and it was C) Spain that established the first colonies in the Americas. The discovery of the New World by Europeans is often attributed to Christopher Columbus, who sailed under the Spanish flag, despite earlier Norse explorations by figures such as Leif Ericson.
However, the Norse settlements, established by Vikings like those found at L'Anse aux Meadows, did not become permanent in contrast to later European colonization.
Indigenous tribes lived in various structures including cliff dwellings, with the A) Anasazi known for such homes. The Vikings, known for their raids and exploration, engaged in trade and had a significant presence in Scandinavia before expanding to other parts of Europe and eventually reaching North America where they encountered indigenous peoples.