Concept:The Kanem-Borno empire began in the Kanem region, and its very first capital was established near Lake Chad.
Explanation:The Kanem-Borno empire was probably founded around the mid-9th century.
Its first capital was at Njimi, which lies to the north-east of Lake Chad.
At this early stage, the state was still known simply as Kanem, and Njimi served as its political and commercial centre.
It was only later, during the 15th century, that the capital was moved to Birni Ngazargamu (or Birni Gazargamu), located in the west.
Because of this westward shift, the empire later became more strongly identified with Borno.
Since Njimi was the earliest capital of the empire, it is the correct option.
Answer:B. Njimi