Concept:Map reading and identification of major geographical features from a Nigerian map sketch.
Explanation:The feature labelled K is a large water body represented on the map.
It is located along the course of the River Niger in the north-central part of Nigeria.
This water body is Lake Kainji, which is one of Nigeria\'s major artificial lakes.
Lake Kainji was created by the construction of the Kainji Dam on the River Niger.
The other options do not match the map position of K.
River Sokoto and River Zamfara are rivers in north-western Nigeria, not the water body shown at K.
Lake Chad is located in the north-eastern part of Nigeria, far from the position of K.
Therefore, the map label K correctly points to Lake Kainji.
Answer:C. Lake Kainji
