Concept:The Horn of Africa is the eastern peninsula of the continent that extends into the Arabian Sea.
Explanation:The Horn of Africa includes Djibouti, Eritrea, Ethiopia, and Somalia.
Among the given options, only Djibouti lies in this region.
Kenya is in East Africa, but it is not part of the Horn of Africa.
Chad is a landlocked country in Central Africa.
Swaziland, now known as Eswatini, is in Southern Africa.
Therefore, the country located within the Horn of Africa is Djibouti.
Answer:B. Djibouti