The correct answer is option 1, Kenya. The Masai tribe is indigenous to Kenya, specifically inhabiting the southern parts of the country primarily around the Great Rift Valley and Maasai Mara National Reserve. It is one of the most well-known and recognized tribes in Africa. The Masai people are known for their distinct culture, traditional attire, and unique way of life, which revolves around pastoralism and cattle herding. They have a rich history and are renowned for their customs, art, and craftsmanship. Therefore, when asked about the tribe to which the Masai people belong, the correct response is Kenya.