Explanation:

The skeletal remains found in burials provide valuable information about the physical characteristics of the people who lived in a particular region. The question asks about the population that the skeletal remains indicate. The correct answer is option D, which means that the skeletal remains show that the population comprised of all of the above-mentioned groups.

Mediterraneans:

The Mediterranean race is a group of people who are characterized by their long and narrow skulls, dark hair, and eyes. They are believed to have originated from the Mediterranean region. The skeletal remains of the people in the burials show that some of them belonged to this group.

Alpines:

The Alpine race is a group of people who are characterized by their round skulls and broad faces. They are believed to have originated from the Alps region. The skeletal remains of the people in the burials show that some of them belonged to this group.

Proto-Australoids:

The Proto-Australoid race is a group of people who are characterized by their broad skulls and flat faces. They are believed to have originated from the Indian subcontinent. The skeletal remains of the people in the burials show that some of them belonged to this group.

Mongoloids:

The Mongoloid race is a group of people who are characterized by their flat faces and narrow eyes. They are believed to have originated from East Asia. The skeletal remains of the people in the burials show that some of them belonged to this group.

Conclusion:

The skeletal remains found in the burials show that the population comprised of Mediterraneans, Alpines, Proto-Australoids, and Mongoloids. This suggests that the people in the region had diverse physical characteristics, which may have been influenced by various factors such as migration, intermarriage, and adaptation to the environment.