Question

which country is shaded? nigeria egypt democratic republic of the congo sudan

Explanation:

Based on the geographical location shown in the image (central - western Africa), and comparing with the given options, Nigeria is located in that general area of Africa. Egypt is in North Africa, the Democratic Republic of the Congo is more towards the central - eastern part of Africa (although it's a large country, its position relative to the shaded area in the image doesn't match as well as Nigeria), and Sudan is in North - eastern Africa.

Answer:

Nigeria