The correct answer is option 'D', which states that people living in the Sahara Desert are Bedouins and Tuaregs.

**Bedouins:**
Bedouins are a nomadic Arab ethnic group traditionally found in the Arabian Peninsula, including parts of the Sahara Desert. They have a long history of living in desert regions and are known for their ability to adapt and survive in extremely harsh conditions. Bedouins are skilled in camel husbandry and have developed a unique culture and way of life centered around their nomadic lifestyle. They move from place to place in search of water and pasture for their herds.

**Tuaregs:**
Tuaregs, also known as the Kel Tamasheq, are a nomadic group primarily found in the Sahara Desert. They are predominantly concentrated in the regions of Mali, Niger, Algeria, Libya, and Burkina Faso. Tuaregs are known for their distinct culture, language, and traditional clothing, including the indigo-dyed garments worn by the men. They have a long history of nomadic life, relying on camel caravans for trade and transportation across the vast desert.

**Explanation:**
The Sahara Desert is the largest hot desert in the world, covering a significant portion of North Africa. It spans across several countries, including Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Sudan, and Tunisia. The extreme climate and harsh conditions of the Sahara make it challenging for permanent settlements, and thus the majority of the population in this region consists of nomadic or semi-nomadic groups, such as the Bedouins and Tuaregs.

These groups have developed unique ways of life that allow them to survive in the desert. They have a deep understanding of desert geography, water sources, and navigation techniques. Both Bedouins and Tuaregs have a strong reliance on camels, which provide them with transportation, food, and other essential resources.

The Bedouins and Tuaregs have managed to maintain their cultural practices and traditions over centuries, despite the changing world around them. They have adapted to modern influences to some extent but still hold on to their ancient way of life, which includes living in tents, herding livestock, and practicing traditional customs and crafts.

In conclusion, the people living in the Sahara Desert are primarily Bedouins and Tuaregs, who have honed their skills and adapted to the challenging environment of the desert over generations. Their nomadic lifestyles and resilience make them an integral part of the Sahara's cultural and historical fabric.